Crossword Genius

Sergeant major facing soldiers? One's unlikely to be this! (6)

Ross

I believe the answer is:

smarmy

'one's unlikely to be this' is the definition.
The definition suggests a singular noun but the answer is not.

'sergeant major facing soldiers?' is the wordplay.
'sergeant major' becomes 'SM' (abbreviation for sergeant major).
'facing' is a charade indicator (letters next to each other).
'soldiers?' becomes 'army' (group of soldiers).
'sm'+'army'='SMARMY'

(Other definitions for smarmy that I've seen before include "Oleaginous" , "Obsequious" , "Smooth" , "Bootlicking" , "Fawning" .)

I've seen this clue in The Guardian.
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