Trouble with Cats? Musical rubbish (4,5)
I believe the answer is:
hair balls
'trouble with cats?' is the definition.
(cats spit out hair balls)
'musical rubbish' is the wordplay.
'musical' becomes 'hair' (1960s musical).
'rubbish' becomes 'balls' (balls can informally mean rubbish or nonsense).
'hair'+'balls'='HAIR-BALLS'
I've seen this clue in The Guardian.
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