Loud salvo calculated to conceal it (5)
I believe the answer is:
vocal
'loud' is the definition.
('vocal' can be similar in meaning to 'loud')
'salvo calculated to conceal it' is the wordplay.
'to conceal it' says the answer is hidden in the clue.
'VOCAL' is hidden within 'salvo calculated'.
(Other definitions for vocal that I've seen before include "Talkative" , "(Performance of) piece that is sung" , "For, giving, voice" , "Spoken" , "Audible in protest" .)