Crossword Genius

VAT on a musical instrument (4)

Ross

I believe the answer is:

tuba

'musical instrument' is the definition.
(tuba is a kind of musical instrument)

'vat on a' is the wordplay.
'vat' becomes 'tub' (synonyms).
'on' is a charade indicator (letters next to each other).
'tub'+'a'='TUBA'

(Other definitions for tuba that I've seen before include "A bass instrument" , "Producer of note" , "member of band" , "bit of brass" , "It's not top brass" .)

I've seen this clue in The Telegraph and The Times.
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