Crossword Genius

Guy's sound external appearance (5)

Ross

I believe the answer is:

guise

'external appearance' is the definition.
(I've seen this in another clue)

'guy's sound' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'guys' is a homophone of 'GUISE'.

(Other definitions for guise that I've seen before include "Appearance, semblance" , "Shape; pretence" , "Show" , "Mask" , "Demeanour" .)

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