Amphibian pulled along, we hear (4)
I believe the answer is:
toad
'amphibian' is the definition.
(toad is a kind of amphibian)
'pulled along we hear' is the wordplay.
'pulled along' becomes 'towed' (towing is a kind of pulling along).
'we hear' shows a homophone (sound like).
'towed' sounds like 'TOAD'.
(Other definitions for toad that I've seen before include "Wind in Willows motorist" , "Warty creature" , "Common amphibian" , "Contemptible person" , "Loathsome creature" .)