Crossword Genius

Expert yearning for stretching (10)

Ross

I believe the answer is:

prolonging

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'stretching' is the definition.
The definition and answer can be both related to change as well as being present participle verbs.
Perhaps they are linked in a way I don't understand?

'expert yearning' is the wordplay.
'expert' becomes 'pro' (short for professional).
'yearning' becomes 'longing' ('long' can be a synonym of 'yearn').
'pro'+'longing'='PROLONGING'

'for' is the link.

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