Detective seen with abrasive old comedian (4,5)
I believe the answer is:
dick emery
'old comedian' is the definition.
'detective seen with abrasive' is the wordplay.
'detective' becomes 'dick' (dick is a kind of detective).
'seen with' means one lot of letters go next to another.
'abrasive' becomes 'emery' (I've seen this before).
'dick'+'emery'='DICK EMERY'
Want a hint initially instead of a full solution?
Install my app