Tropical lizards inhabiting Antiguan ash-heaps (7)
I believe the answer is:
iguanas
'tropical lizards' is the definition.
(I've seen this in another clue)
'inhabiting antiguan ash-heaps' is the wordplay.
'inhabiting' indicates the answer is hidden within the clue.
'IGUANAS' can be found hidden inside 'antiguan ash heaps'.
(Other definitions for iguanas that I've seen before include "Tropical tree lizards" , "Asia gun (anag.)" , "tropical natives" , "beasts" , "Large lizards" .)