klešču

kleštiti `castrate' [verb];

klestiti `prune, clear, castrate' [verb]

klestiti `castrate' [verb], klešču [1sg]

kleścić (dial.) `castrate' [verb], kleszczę [1sg], kleścisz [2sg];

kleszczyc (1902) `castrate' [verb]

Comments: Apparently a derivative of -> *klěšča. The ESSJa suggests that forms reflecting * klestiti are analogical after * pustiti, 1sg. *puščǫ. This may very well be correct, but it should be noted that the West Slavic forms with *- šč-, which could be analogical after the present stem or the noun *klěšča, are comparatively recent.