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Fighters equal to a limit, changing sign (14)

Ross

I believe the answer is:

paramilitaries

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'fighters' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'equal to a limit changing sign' is the wordplay.
'equal to' becomes 'para' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'changing' indicates an anagram.
'sign' becomes 'Aries' (star sign).
'limit' with letters rearranged gives 'milit'.
'para'+'milit'+'aries'='PARAMILITARIES'

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I've seen this clue in The Daily Express.
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