Crossword Genius

Liar upset saint fast (9)

Ross

I believe the answer is:

fantasist

'liar' is the definition.

'upset saint fast' is the wordplay.
'upset' is an anagram indicator.
'saint'+'fast'='saintfast'
'saintfast' anagrammed gives 'FANTASIST'.

(Other definitions for fantasist that I've seen before include "Walter Mitty type?" , "Creator of very imaginative fiction" , "Dreamer" .)

I've seen this clue in The Mirror.
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