Obscure but keen point tricks insiders (7)
I believe the answer is:
cryptic
'obscure' is the definition.
(I've seen this before)
'keen point tricks insiders' is the wordplay.
'keen' becomes 'cry' (keen can mean 'wail in grief').
'point' becomes 'pt' (abbreviation for point).
'insiders' indicates the central letters.
The middle letters of 'tricks' are 'ic'.
'cry'+'pt'+'ic'='CRYPTIC'
'but' acts as a link.
(Other definitions for cryptic that I've seen before include "Obscure or puzzling (as our neighbour Crossheir)" , "Like some crosswords" , "Sort of crossword" , "Obscure or puzzling (as our page neighbour Crosaire)" , "Like our other puzzle" .)