Crossword Genius

Made sharp, if coach regularly employed (7)

Ross

I believe the answer is:

focused

'made sharp' is the definition.
(focus can mean to sharpen or make less blurry)

'if coach regularly employed' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'employed' becomes 'used' ('use' can be a synonym of 'employ').
'if'+'coach'='ifcoach'
The alternating letters of 'ifcoach' are 'foc'.
'foc'+'used'='FOCUSED'

(Other definitions for focused that I've seen before include "(Of light) brought to a point" , "not easily diverted" , "Concentrated on - like camera" .)

I've seen this clue in The Guardian.
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