Making up some popular airing (9)
I believe the answer is:
inventing
'making up' is the definition.
('invent' can be a synonym of 'make up')
'some popular airing' is the wordplay.
'some popular' becomes 'in' ('in' can mean trendy).
'airing' becomes 'venting' ('vent' can be a synonym of 'air').
'in'+'venting'='INVENTING'
I've seen this clue in the Sydney Morning Herald.
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