Crossword Genius

Special skill or knowledge (9)

Ross

I believe the answer is:

expertise

'special skill or knowledge' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for expertise that I've seen before include "professionalism" , "Adroitness" , "Mastery, proficiency" , "Thorough knowledge" , "Technical skill" .)

I've seen this clue in The Irish Times and the Sydney Morning Herald.
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