Crossword Genius

Coaches author, one quiet and nerdy (15)

Ross

I believe the answer is:

trainspotterish

'nerdy' is the definition.
(I know that trainspotterish is a more specific form of the attribute nerdy)

'coaches author one quiet' is the wordplay.
'coaches' becomes 'trains' (coach can mean to train or educate).
'author' becomes 'potter' (Beatrix Potter 1866-1943).
'one' becomes 'i' (Roman numeral).
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'trains'+'potter'+'i'+'sh'='TRAINSPOTTERISH'

'and' acts as a link.

I've seen this clue in The Times.
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