Sharp right turns in front of entrance (9)
I believe the answer is:
trenchant
'sharp' is the definition.
(I've seen this before)
'right turns in front of entrance' is the wordplay.
'right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'turns' says the letters should be written in reverse.
'in front of' is a charade indicator (letters next to each other).
'entrance' becomes 'enchant' (to entrance is to enchant or bewitch).
'rt' reversed gives 'tr'.
'tr'+'enchant'='TRENCHANT'
(Other definitions for trenchant that I've seen before include "blunt" , "Distinct" , "Cutting, forthright" , "Clear" , "Fierce" .)