Boasts - could start squabbles! (5)
I believe the answer is:
crows
'boasts' is the definition.
(crowing is a kind of boasting)
'could start squabbles' is the wordplay.
'start' suggests taking the first letters.
'squabbles' becomes 'rows' (I've seen this in another clue).
The first letter of 'could' is 'c'.
'c'+'rows'='CROWS'
(Another definition for crows that I've seen is " Black birds; boasts".)
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