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We present observations of SN 2021csp, a unique supernova (SN) which displaysevidence for interaction with H- and He- poor circumstellar material (CSM) atearly times. Using high-cadence spectroscopy taken over the first week afterexplosion, we show that the spectra of SN 2021csp are dominated by C III lineswith a velocity of 1800 km s$^{-1}$. We associate this emission with CSM lostby the progenitor prior to explosion. Subsequently, the SN displays narrow Helines before metamorphosing into a broad-lined Type Ic SN. We model thebolometric light curve of SN 2021csp, and show that it is consistent with theenergetic ($4\times10^{51}$ erg) explosion of a stripped star, producing 0.4M$_\odot$ of 56Ni within a $\sim$1 M$_\odot$ shell of CSM extending out to 400R$_\odot$.

SN 2021csp -- the explosion of a stripped envelope star within a H and He-poor circumstellar medium