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Euphoric old hack is drunk in supermarket (4-1-4)

Ross

I believe the answer is:

cock-a-hoop

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

'euphoric' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

'old hack is drunk in supermarket' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'is drunk' indicates anagramming the letters.
'in' indicates putting letters inside.
'supermarket' becomes 'Co-op' (The Co-operative).
'o'+'hack'='ohack'
'ohack' is an anagram of 'ckaho'.
'ckaho' going inside 'coop' is 'COCK-A-HOOP'.

Can you help me to learn more?

(Other definitions for cock-a-hoop that I've seen before include "Extremely pleased" , "Feeling triumphant like male bird with toy" , "Jumping for joy" , "Overjoyed" , "Elated" .)

I've seen this clue in The Independent.
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