Merry, Ray plays harp drunkenly (5,2,5)

I believe the answer is:

happy as larry

'drunkenly' is the definition.

'merry ray plays harp' is the wordplay.
'merry' indicates an anagram (merry can mean drunk).
'ray'+'plays'+'harp'='rayplaysharp'
'rayplaysharp' is an anagram of 'HAPPY AS LARRY'.

(Other definitions for happy as larry that I've seen before include "Proverbially contented" , "Feeling (lamblike?) contentment" .)

I've seen this clue in The Everyman puzzle in The Observer.

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