Still in the venture (4)
I believe the answer is:
even
'still' is the definition.
(synonyms)
'in the venture' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EVEN' can be found hidden inside 'the venture'.
(Other definitions for even that I've seen before include "Flattened" , "Crisp and ---, how King Wenceslas found the snow" , "draw" , "of consistent quality" , "Iron - uniform - flat" .)