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We present an analysis of $\emph{VI}$ CCD time series photometry of globularcluster NGC 6712. Our main goal is to study the variable star population asindicators of the cluster mean physical parameters. We employed the Fourierdecomposition of RR Lyrae light curves to confirm that $[\rm Fe/H]_{UVES} =-1.0 \pm 0.05$ is a solid estimate. We estimated the reddening to the clusteras $E(B-V)$ = 0.35 $\pm$ 0.04 from the RRab stars colour curves. The distanceto the cluster was estimated using three independent methods which yielded aweighted mean distance $\big < d \big>$ = 8.1 $\pm$ 0.2 kpc. The distributionof RRab and RRc stars on the HB shows a clear segregation around the firstovertone red edge of the instability strip, which seems to be a common featurein OoI-type cluster with a very red horizontal branch. We carried out amembership analysis of 60,447 stars in our FoV using the data from $Gaia$-DR2and found 1529 likely members; we possess the light curves of 1100 among themember stars. This allowed us to produce a clean colour-magnitude diagram,consistent with an age of 12 Gyrs, and enabled us to discover close unresolvedcontaminants for several variable stars. From the proper motion analysis wefound evidence of non-member stars in the FoV of the cluster being tidallyaffected by the gravitational pull of the bulge of the Galaxy. We found thatthe RRab variable V6, shows a previously undetected Blazhko effect. Finally, wereport sixteen new variables of the EW-type (9) and SR-type (7).

NGC 6712: the variable star population of a tidally disrupted globular cluster