Crossword Genius

Sounding extremely ecstatic when given appropriate stuff (8)

Ross

I believe the answer is:

echogram

'sounding' is the definition.
(measurement made using sound waves)

'extremely ecstatic when given appropriate stuff' is the wordplay.
'extremely' means to remove the middle letters.
'when given' says to put letters next to each other.
'appropriate' becomes 'hog' (both can mean to take for oneself).
'stuff' becomes 'ram' (ramming is a kind of stuffing).
'ecstatic' with its middle taken out is 'ec'.
'ec'+'hog'+'ram'='ECHOGRAM'

I've seen this clue in The Times.
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