Healthy also underneath masks (5)

I believe the answer is:

sound

'healthy' is the definition.
(similar in meaning)

'also underneath masks' is the wordplay.
'masks' indicates a hidden word.
'SOUND' can be found hidden inside 'also underneath'.

(Other definitions for sound that I've seen before include "Speaking" , "Financially stable" , "well" , "Fit" , "Noise; in good condition" .)

I've seen this clue in The Telegraph.

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