Mulish (3-6)

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3-6

obstinate

'mulish' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for obstinate that I've seen before include "such as a mule" , "headstrong" , "Female bird" , "Mulish" , "Cussed" .)

I've seen this clue in the Evening Standard and The Guardian.

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