Clue: 'Garpen' for 24? (9,6)
Answer: PAPERBACK WRITER
Explanation: Definition: 24
*Paperback Writer* is another Beatles No.1 
'**Gar****pen**' splits into: '**Gar**' which is 'rag' reversed or PAPER, BACK; plus '**pen**'=WRITER
 
'rag' as in a low quality newspaper