Excessively particular (5)

I believe the answer is:

picky

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

This is the entire clue.

(Other definitions for picky that I've seen before include "Excessively fastidious" , "Finicky" , "Excessively particular" , "Fussy" , "Discriminating" .)

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

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