Crossword Genius

Officer's sound heart (7)

Ross

I think it could be either:

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6

7

colonel

'officer's' is the definition.
(colonel is a kind of officer)

'sound heart' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'heart' becomes 'kernel' ('kernel' can be a synonym of 'heart').
'kernel' sounds like 'COLONEL'.

(Other definitions for colonel that I've seen before include "Senior army officer" , "Army rank" , "Comissioned military officer" , "Military rank" , "Commissioned officer" .)

I've seen this clue in The Telegraph.
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