Girl is hot-headed, presumably a colleen (5)

I believe the answer is:

irish

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'girl is hot-headed presumably a colleen' is the definition.
I can't judge whether this defines the answer.

'girl is hot' is the wordplay.
'girl' becomes 'iris' (girl's name).
'is hot' becomes 'h' (abbreviation eg on taps).
'iris'+'h'='IRISH'

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(Other definitions for irish that I've seen before include "Celtic language" , "Gaelic language" , "Native to Erin" , "Kind of whiskey" , "Reddish-brown dog" .)

I've seen this clue in the Evening Standard.

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