Marine reptile (6)

I think it could be either:

Which length description are you looking for?:

3,5

turtle

'marine reptile' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for turtle that I've seen before include "Reptile with bony shell" , "Sea swimmer" , "marine animal" , "that flies in 2nd" , "Shelled marine creature" .)

I've seen this clue in The Telegraph, The Times and The Guardian.

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