Crossword Genius

Guessing that broken ties are coupling (10)

Ross

I believe the answer is:

estimating

'guessing' is the definition.
('estimate' can be a synonym of 'guess')

'broken ties are coupling' is the wordplay.
'broken' indicates an anagram.
'are coupling' becomes 'mating' (I've seen this before).
'ties' is an anagram of 'esti'.
'esti'+'mating'='ESTIMATING'

'that' acts as a link.

(Another definition for estimating that I've seen is " Judging worth".)

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