Crossword Genius

Some short sharp romance for Hart? (3)

Ross

I believe the answer is:

pro

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'hart?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'some short sharp romance' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'PRO' is hidden in the letters of 'short sharp romance'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for pro that I've seen before include "hooker" , "For; non-amateur" , "Top player" , "Paid worker" , "Expert (abbr)" .)

I've seen this clue in the Sydney Morning Herald.
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