Trained and incisive (7)
I believe the answer is:
pointed
This clue is a double definition.
'trained' is the first definition.
(pointing is a kind of training)
'incisive' is the second definition.
(thesaurus)
'and' is the link.
(Other definitions for pointed that I've seen before include "Of remark, direct and cutting" , "Sharp-ended" , "Sharp -- indicated" , "Sharply tapered" , "Barbs" .)