Judge to be a feminine fathead? (6)

I believe the answer is:

assess

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'judge' is the definition.
(to assess is to judge or rate)

I don't understand how the remainder of the clue works.

(Other definitions for assess that I've seen before include "Test" , "'Evaluate, appraise (6)'" , "Estimate the worth or quality of" , "Fix the amount of tax" , "Evaluate, estimate" .)

I've seen this clue in the Evening Standard.

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