Crossword Genius

Pal's constant noise (4)

Ross

I believe the answer is:

chum

'pal's' is the definition.
(synonyms)

'constant noise' is the wordplay.
'constant' becomes 'c' (mathematical abbreviation).
'noise' becomes 'hum' (hum is a kind of noise).
'c'+'hum'='CHUM'

(Other definitions for chum that I've seen before include "Informally, a close friend" , "Good friend" , "Pal, mate" , "Salmon" , "Pal, buddy" .)

I've seen this clue in The Independent.
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