Crossword Genius

Express disapproval with mass roar (4)

Ross

I believe the answer is:

boom

'roar' is the definition.
(synonyms)

'express disapproval with mass' is the wordplay.
'express disapproval' becomes 'boo' (as in a crowd booing).
'with' is a charade indicator (letters next to each other).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'boo'+'m'='BOOM'

(Other definitions for boom that I've seen before include "Resound - spar - economic growth" , "Harbour barrier" , "Prosper vigorously - waterway barrier" , "When business is great, opposite to bust" , "Pole for overhead microphone - deep sound" .)

I've seen this clue in The Times.
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