Pulled an amphibian, say (5)
I believe the answer is:
towed
'pulled' is the definition.
(I've seen this in another clue)
'an amphibian say' is the wordplay.
'an amphibian' becomes 'toad' (toad is a kind of amphibian).
'say' indicates a 'sounds like' (homophone) clue.
'toad' is a homophone of 'TOWED'.
(Other definitions for towed that I've seen before include "Helped when powerless" , "Hauled" , "Dragged behind" , "Pulled along" , "drawn" .)