Crossword Genius

Supporter of dumb rationales (3)

Ross

I believe the answer is:

bra

'supporter' is the definition.
(thesaurus)

'of dumb rationales' is the wordplay.
'of' indicates a hidden word.
'BRA' can be found hidden inside 'dumb rationales'.

(Other definitions for bra that I've seen before include "Chest supporter" , "Female undergarment" , "Underwear item" , "support" , "I give a couple a lift" .)

I've seen this clue in The Independent.
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