Crossword Genius

Nerd or nut with niche joke, possibly (12)

Ross

I believe the answer is:

technojunkie

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'nerd' is the definition.
I know nothing about this answer so I can't judge whether this works.

'nut with niche joke possibly' is the wordplay.
'with' says to put letters next to each other.
'possibly' indicates anagramming the letters.
'niche'+'joke'='nichejoke'
'nut' after 'nichejoke' is 'nichejokenut'.
'nichejokenut' with letters rearranged gives 'TECHNOJUNKIE'.

'or' acts as a link.

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I've seen this clue in The Times.
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