Crossword Genius

Fast getting tied in a knot! (4)

Ross

I believe the answer is:

diet

'fast' is the definition.
(diet is a kind of fast)

'tied in a knot' is the wordplay.
'in a knot' indicates an anagram.
'tied' is an anagram of 'DIET'.

'getting' acts as a link.

(Other definitions for diet that I've seen before include "Attempt to shift a few pounds" , "provisions" , "Worms once a source of this" , "Prescribed selection of foods" , "Food and drink regularly consumed" .)

I've seen this clue in the Evening Standard.
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