Crossword Genius

Amateur enthusiast coaches snooker player (12)

Ross

I believe the answer is:

trainspotter

'amateur enthusiast' is the definition.
(amateur enthusiastic about trains )

'coaches snooker player' is the wordplay.
'coaches' becomes 'trains' ('train' can be a synonym of 'coach').
'snooker player' becomes 'potter' (someone who pots snooker balls).
'trains'+'potter'='TRAINSPOTTER'

(Other definitions for trainspotter that I've seen before include "anorak" , "Gricer" , "Boring person" , "Nerd" , "One interested in engines" .)

I've seen this clue in The Independent.
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