Fine wearing jumper, effervescent (8)
I believe the answer is:
frothing
'effervescent' is the definition.
(similar in meaning)
'fine wearing jumper' is the wordplay.
'fine' becomes 'thin' (similar in meaning).
'wearing' indicates putting letters inside.
'jumper' becomes 'frog' (something which jumps).
'thin' placed within 'frog' is 'FROTHING'.
(Another definition for frothing that I've seen is " Bubbling".)
I've seen this clue in The Guardian.
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