Alfie —, comedy actor who co-starred with Bill Fraser in 1960s ITV sitcom Bootsie and Snudge (4)

I believe the answer is:

bass

(Other definitions for bass that I've seen before include "Fish (which sings?)" , "Big percussion instrument" , "Booming percussion instrument" , "Low singer" , "Freshwater fish and lowest voice" .)

I've seen this clue in The Mirror.

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