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' says to take the initial letters.
'squabbles' becomes 'rows' (I've seen this in another clue).
The initial letter of 'could' is 'c'.
'c'+'rows'='CROWS'
(Another definition for crows that I've seen is " Black birds; boasts".)
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