Crossword Genius

Showing the effects of excessive pourboires? (5)

Ross

I believe the answer is:

tipsy

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

'showing the effects of excessive' is the definition.
I can't tell whether this definition defines the answer.

'pourboires?' is the wordplay.
I cannot quite understand how this works, but
'pourboires?' could be 'tips' (I've seen this in another clue) and 'tips' is located in the answer.
A single letter 'y' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for tipsy that I've seen before include "1 over 8" , "Slightly drunk" , "Loaded" , "Rather drunk" , "Inebriated" .)

I've seen this clue in the Evening Standard.
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