Here you might catch top dog (4)
I believe the answer is:
peke
'dog' is the definition.
(short for Pekingese)
'here you might catch top' is the wordplay.
'here you might catch' indicates a 'sounds like' (homophone) clue ('catch' can mean to hear something).
'top' becomes 'peak' (synonyms).
'peak' is a homophone of 'PEKE'.
(Other definitions for peke that I've seen before include "In short, it's a small short-legged dog" , "Snub-nosed lap-dog (colloq.)" , "Small snub-nosed dog" , "Sort of lapdog" , "5 [MANS BEST FRIEND]" .)