Crossword Genius

Sip more in evidence of moral lapse (6,7)

Ross

I believe the answer is:

broken promise

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

'moral lapse' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'sip more in evidence of' is the wordplay.
I cannot really understand how this works, but
'more' could be 'm' and 'm' is present in the answer.
'evidence' could be 'pro' (pro is a kind of evidence) and 'pro' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Hindu.
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