Resent band's attitude (7)

I believe the answer is:

mindset

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'attitude' is the definition.
(I have seen 'fixed attitude' mean 'mindset' so perhaps 'attitude' could also mean 'mindset')

'resent band's' is the wordplay.
'resent' becomes 'mind' (I am not sure about this - if you are sure you should believe this answer much more).
'band' becomes 'set' (synonyms).
'mind'+'set'='MINDSET'

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(Other definitions for mindset that I've seen before include "convictions" , "thinking normally" , "way of thinking" , "fixed attitude" , "Outlook" .)

I've seen this clue in The Telegraph.

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