Call girl to play idly with dog, say (8)
I believe the answer is:
strumpet
'call girl' is the definition.
(I've seen this before)
'play idly with dog say' is the wordplay.
'play idly' becomes 'strum' (I've seen this before).
'with' says to put letters next to each other.
'dog say' becomes 'pet' (dog is an example).
'strum'+'pet'='STRUMPET'
'to' is the link.
(Other definitions for strumpet that I've seen before include "'... City' (novel by James Plunkett)" , "Lady of disrepute" , "Trumpets for loose woman" , "promiscuous, lady" , "Promiscuous woman" .)