Merry ending to an easy piece (5)

I believe the answer is:

tipsy

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'merry' is the definition.
(I've seen this before)

'ending to an easy piece' is the wordplay.
'ending' becomes 'tip'.
'to an easy piece' becomes 'sy' (I am not sure about this - if you are sure you should believe this answer much more).
'tip'+'sy'='TIPSY'

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

I've seen this clue in the Evening Standard.

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