Crossword Genius

Maybe bass part loud one needed at the start (3)

Ross

I believe the answer is:

fin

'maybe bass part' is the definition.
(part of a fish eg a bass)

'loud one needed at the start' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'one' becomes 'i' (Roman numeral).
'at the start' suggests taking the first letters.
The first letter of 'needed' is 'n'.
'f'+'i'+'n'='FIN'

(Other definitions for fin that I've seen before include "For movement and balance in fish" , "Fish propeller; end (Fr.)" , "Aerodynamic surface" , "Found on a fish" , "Swimmer" .)

I've seen this clue in The Times.
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