Crossword Genius

Permit fighting rhetoric (7)

Ross

I believe the answer is:

warrant

'permit' is the definition.
(thesaurus)

'fighting rhetoric' is the wordplay.
'fighting' becomes 'war'.
'rhetoric' becomes 'rant' (rant is a kind of rhetoric).
'war'+'rant'='WARRANT'

(Other definitions for warrant that I've seen before include "Document giving authority" , "Guaranty - authorisation to make an arrest" , "Travel pass" , "Justify; authorisation" , "Permit for arrest, search of premises, etc" .)

I've seen this clue in The Times.
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