Too involved in cultural sociology (4)
I believe the answer is:
also
'too' is the definition.
('also' can be a synonym of 'too')
'involved in cultural sociology' is the wordplay.
'involved in' indicates the answer is hidden within the clue.
'ALSO' can be found hidden inside 'cultural sociology'.
(Other definitions for also that I've seen before include "item's rarely used now for this" , "Furthermore" , "Plus" , "'Besides, moreover (4)'" , "Additionally" .)