Crossword Genius

Extremely dull romance developed with shy doctor (7,5)

Ross

I believe the answer is:

leonard mccoy

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'doctor' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'extremely dull romance developed with shy' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (letters on the extremes of the word are used).
'developed' is an anagram indicator.
'with' is a charade indicator (letters next to each other).
'shy' becomes 'coy' (coy can mean shy or modest).
'dull' with its centre taken out is 'dl'.
'dl'+'romance'='dlromance'
'dlromance' is an anagram of 'leonardmc'.
'leonardmc'+'coy'='LEONARD MCCOY'

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I've seen this clue in The Independent.
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