Biblical reptile repents, unusually (7)

I believe the answer is:

serpent

'biblical reptile' is the definition.
(I've seen this in another clue)

'repents unusually' is the wordplay.
'unusually' indicates an anagram.
'repents' anagrammed gives 'SERPENT'.

(Other definitions for serpent that I've seen before include "Malicious person" , "Instrument of the past" , "Large snake; sly person" , "exhibit at zoo" , "Early wind instrument" .)

I've seen this clue in The Sun.

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