Crossword Genius

Barnet Fair following turning to hot fare (6)

Ross

I believe the answer is:

hairdo

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'barnet' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for hairdo that I've seen before include "What one may have expected from 'Sweeney Todd'" , "Coiffure (colloq.)" , "Possibly cut" , "Bob, perm or bouffant" , "Pageboy maybe" .)

I've seen this clue in The Times and The Sunday Times.
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