Highly elated (7,2,3)

I think it could be either:

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7,2,3

walking on air

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

This is the entire clue.

(Other definitions for walking on air that I've seen before include "Highly elated" , "In seventh heaven" , "Extremely happy" .)

I've seen this clue in The Times, The Sunday Times and The Guardian.

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