Crossword Genius

To extend my range as Duke, I write poetry (9)

Ross

I believe the answer is:

diversify

'to extend my range' is the definition.
(as in diversifying one's activities)

'duke i write poetry' is the wordplay.
'duke' becomes 'd' (abbreviation).
'write poetry' becomes 'versify' (I've seen this before).
'd'+'i'+'versify'='DIVERSIFY'

'as' acts as a link.

(Other definitions for diversify that I've seen before include "To do something different" , "Become more varied" .)

I've seen this clue in The Guardian.
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