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MeerKAT's large number of antennas, spanning 8 km with a densely packed 1 kmcore, create a powerful instrument for wide-area surveys, with high sensitivityover a wide range of angular scales. The MeerKAT Galaxy Cluster Legacy Survey(MGCLS) is a programme of long-track MeerKAT L-band (900-1670 MHz) observationsof 115 galaxy clusters, observed for $\sim$6-10 hours each in fullpolarisation. The first legacy product data release (DR1), made available withthis paper, includes the MeerKAT visibilities, basic image cubes at $\sim$8"resolution, and enhanced spectral and polarisation image cubes at $\sim$8" and15" resolutions. Typical sensitivities for the full-resolution MGCLS imageproducts are $\sim$3-5 {\mu}Jy/beam. The basic cubes are full-field and span 4deg^2. The enhanced products consist of the inner 1.44 deg^2 field of view,corrected for the primary beam. The survey is fully sensitive to structures upto $\sim$10' scales and the wide bandwidth allows spectral and Faraday rotationmapping. HI mapping at 209 kHz resolution can be done at $0<z<0.09$ and$0.19<z<0.48$. In this paper, we provide an overview of the survey and DR1products, including caveats for usage. We present some initial results from thesurvey, both for their intrinsic scientific value and to highlight thecapabilities for further exploration with these data. These include a primarybeam-corrected compact source catalogue of $\sim$626,000 sources for the fullsurvey, and an optical/infrared cross-matched catalogue for compact sources inAbell 209 and Abell S295. We examine dust unbiased star-formation rates as afunction of clustercentric radius in Abell 209 and present a catalogue of 99diffuse cluster sources (56 are new), some of which have no suitablecharacterisation. We also highlight some of the radio galaxies which challengecurrent paradigms and present first results from HI studies of four targets.

The MeerKAT Galaxy Cluster Legacy Survey I. Survey Overview and Highlights