Study involving some ravine (6)
I believe the answer is:
canyon
'ravine' is the definition.
(canyon is a kind of ravine)
'study involving some' is the wordplay.
'study' becomes 'con' (I've seen this before).
'involving' means one lot of letters goes inside another.
'some' becomes 'any' ('any' can be similar in meaning to 'some').
'con' going around 'any' is 'CANYON'.
(Other definitions for canyon that I've seen before include "A deep gorge with a river, may be Grand" , "rift created" , "river valley" , "grand spectacle in Arizona" , "Deep, steep-sided valley" .)