To a dunderhead, an unattractive creature (4)

I believe the answer is:

toad

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'unattractive creature' is the definition.
'toad' can be an answer for 'creature' (toad is a kind of creature). I'm not certain of the 'unattractive' bit.

'to a dunderhead' is the wordplay.
'dunderhead' becomes 'd' (head letter of 'dunder').
'to'+'a'+'d'='TOAD'

'an' is the link.

Can you help me to learn more?

(Other definitions for toad that I've seen before include "species of amphibian" , "Amphibian with warts" , "Dangerous driver" , "Stout-bodied amphibian" , "Ugly creature, jewel in head (AYLI)" .)

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