Sharp edges of Tatar charm (9)
I believe the answer is:
trenchant
'sharp' is the definition.
(I've seen this before)
'edges of tatar charm' is the wordplay.
'edges of' says to hollow out the word (remove centre letters).
'charm' becomes 'enchant' (enchanting is a kind of charming).
'tatar' with its middle taken out is 'tr'.
'tr'+'enchant'='TRENCHANT'
(Other definitions for trenchant that I've seen before include "Fierce" , "Forceful" , "blunt" , "Vigorous, incisive" , "Forthright, vigorous" .)