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Reptile in charge, Britain's lowest point? (6)

Ross

I think it could be either:

Which length description are you looking for?:

6

6,4

'reptile' is the definition.
(lizard is a kind of reptile)

I cannot understand how the rest of the clue works.

(Other definitions for lizard that I've seen before include "Reptile with two pairs of legs" , "Reptile such as skink" , "A reptile; a Cornish Head" , "Reptile with four legs and a tapering tail" , "See 1 Across" .)

I've seen this clue in The Guardian.
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