Reptile found in Southernmost Cornwall (6)

I believe the answer is:

lizard

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'reptile' is the definition.
(I know that lizard is a type of saurian)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lizard that I've seen before include "Kind of reptile - chameleon is one" , "Two-legged reptile" , "Gecko, for example" , "Four-legged reptile" , "Reptile with four legs and a tapering tail" .)

I've seen this clue in The Mirror.

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