9 across
Exploit
flyer
with
imperfect
tenses
to
get
personal
benefit
(7,4,4)
Exploit flyer with imperfect tenses to get personal benefit (7,4,4)
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The definition is at the end of the clue.
How the clue works
Look at to get personal benefit at the end — that's your definition, meaning to enrich oneself. You build the answer from exploit giving FEAT, then flyer giving HERON, then imperfect tenses — "imperfect" is your anagram indicator, so scramble tenses to get ESNEST. String them all together and FEAT + HERON + ESNEST splits neatly into FEATHER ONES NEST.