Unequivocal gossip gets investment from City (6)
I believe the answer is:
direct
'unequivocal' is the definition.
(thesaurus)
'gossip gets investment from city' is the wordplay.
'gossip' becomes 'dirt' (as in the phrase 'dish the dirt').
'gets investment from' means one lot of letters goes inside another (some letters are invested into others).
'city' becomes 'ec' (the City of London postcode).
'dirt' placed around 'ec' is 'DIRECT'.
(Other definitions for direct that I've seen before include "Supervise; unambiguous" , "As the crow flies" , "Frank; unambiguous" , "Show someone the way" , "Straightforward; control" .)