Island contributing to risky enterprise (4)
I believe the answer is:
skye
'island' is the definition.
(Scottish island)
'contributing to risky enterprise' is the wordplay.
'contributing to' indicates the answer is hidden within the clue (the answer contributes to part of the clue ).
'SKYE' can be found hidden inside 'risky enterprise'.
(Other definitions for skye that I've seen before include "Home of the Cuillin mountains" , "Isle; terrier type" , "Scot. island, toll bridge" , "Destination of a princely boat trip" , "Scottish location" .)