Convivial excuse for being tipsy? (5)

I believe the answer is:

binge

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

'being tipsy?' is the wordplay.
'tipsy?' indicates an anagram (I've seen 'tipsy' mean this).
'being' is an anagram of 'BINGE'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for binge that I've seen before include "Bender" , "Bout of indulgence" , "drunken revelry" , "Wild spree" , "Bust" .)

I've seen this clue in The Globe and Mail.

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