Crossword Genius

Expert in tracery (3)

Ross

I believe the answer is:

ace

'expert' is the definition.
(ace can informally mean very good)

'in tracery' is the wordplay.
'in' indicates a hidden word.
'ACE' is hidden in the letters of 'tracery'.

(Other definitions for ace that I've seen before include "Tennis serve that the receiver is unable to reach" , "One-spotted card" , "Hole in one; very good" , "Outstanding" , "reason for point of no return" .)

I've seen this clue in The Mirror.
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