Crossword Genius

..... to notice amphibian .... (4)

Ross

I believe the answer is:

toad

'amphibian' is the definition.
(toad is a kind of amphibian)

'to notice' is the wordplay.
'notice' becomes 'ad' (short for advert).
'to'+'ad'='TOAD'

(Other definitions for toad that I've seen before include "Dangerous driver" , "not found in Ireland" , "Hateful person; animal" , "Ugly creature, jewel in head (AYLI)" , "Warty amphibian" .)

I've seen this clue in the Sydney Morning Herald.
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