Donated to what's concealed in Malaga venture (4)
I believe the answer is:
gave
'donated' is the definition.
(give can mean to donate)
'what's concealed in malaga venture' is the wordplay.
'what's concealed in' indicates a hidden word.
'GAVE' is hidden within 'malaga venture'.
'to' is the link.
(Other definitions for gave that I've seen before include "Caved in" , "Buckled" , "Yielded; hosted (a party)" , "Handed over" , "made a donation" .)