Lynx, duck and pet (6)
I believe the answer is:
bobcat
'lynx' is the definition.
(I know that bobcat is a type of lynx)
'duck and pet' is the wordplay.
'duck' becomes 'bob' ().
'and' is a charade indicator (letters next to each other).
'pet' becomes 'cat' (cats are often kept as pets).
'bob'+'cat'='BOBCAT'
(Other definitions for bobcat that I've seen before include "Relation of the lynx" , "Kind of lynx" , "Small lynx of Norht America" , "North American feline" , "Small N American lynx" .)