Crossword Genius

Voice disapproval of Mike’s resonant delivery? (4)

Ross

I believe the answer is:

boom

'resonant delivery?' is the definition.
(as in a booming voice)

'voice disapproval of mike's' is the wordplay.
'voice disapproval of' becomes 'boo' (to boo something is to voice disapproval of it).
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'boo'+'m'='BOOM'

(Other definitions for boom that I've seen before include "Resound - spar - economic growth" , "Deep hollow sound" , "time of 22 [PROSPERITY]" , "Prosperity - hollow roaring noise" , "Cry of the bittern" .)

I've seen this clue in The Times.
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