Whit appointment curtailed and put back (3)

I believe the answer is:

tad

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'whit' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for tad that I've seen before include "Smidgen" , "Little bit" , "(A) bit, touch" , "Slight amount" , "Small bit" .)

I've seen this clue in The Times.

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