Singer and French hound (6)
I believe the answer is:
basset
'hound' is the definition.
(basset hound is an example)
'singer and french' is the wordplay.
'singer' becomes 'bass' (bass is a kind of singer).
'and french' becomes 'et' ('and' in French).
'bass'+'et'='BASSET'
(Other definitions for basset that I've seen before include "Short-legged hound that hunts hares" , "Hare-hunting hound among beasts" , "Short-legged dog" , "Type of horn" , "Sturdy hunting dog" .)