Crossword Genius

Traitor within fraternity (3)

Ross

I believe the answer is:

rat

'traitor' is the definition.
(rat can mean a treacherous person)

'within fraternity' is the wordplay.
'within' indicates a hidden word.
'RAT' is hidden within 'fraternity'.

(Other definitions for rat that I've seen before include "one not going down with ship" , "person doing shopping" , "Abandon" , "Scumbag" , "one who deserts the sinking ship?" .)

I've seen this clue in The Mirror.
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