Flayed having transgressed, crossing king (7)
I believe the answer is:
skinned
'flayed' is the definition.
(I've seen this before)
'transgressed crossing king' is the wordplay.
'transgressed' becomes 'sinned' (sinning is a kind of transgressing).
'crossing' indicates putting letters inside.
'king' becomes 'K' (abbreviation for king in chess).
'sinned' going around 'k' is 'SKINNED'.
'having' acts as a link.
(Other definitions for skinned that I've seen before include "Removed outer layer" , "Removed pelt" , "Fleeced" , "Removed the outer covering" , "Flayed" .)