Initiator of enterprise needs one in support (7)
I believe the answer is:
pioneer
'initiator of enterprise' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'one in support' is the wordplay.
'in' indicates putting letters inside.
'support' becomes 'pier' (type of structure).
'one' inserted into 'pier' is 'PIONEER'.
'needs' acts as a link.
Can you help me to learn more?
(Other definitions for pioneer that I've seen before include "break new ground" , "Innovator; early settler" , "Innovate" , "Founder" , "person arriving early" .)