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Smart alecs guess why I broke no hearts (4,4)

Ross

I believe the answer is:

wise guys

I'm a little stuck... Click here to teach me more about this clue!

'smart alecs' is the definition.
(both can mean annoyingly clever people)

'guess why i broke no hearts' is the wordplay.
I cannot quite see how this works, but
'why' could be 'y' and 'y' is located in the answer.
an anagram of 'guess' is 'segus' which is located in the remaining letters.
'i' is within the answer.
A single letter 'w' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for wise guys that I've seen is " Smart Alecs?".)

I've seen this clue in The Telegraph.
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