The reptile file (9)
I believe the answer is:
crocodile
This might be a double definition.
'the reptile' is the first definition.
(crocodile is a kind of reptile)
'file' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
Can you help me to learn more?
(Other definitions for crocodile that I've seen before include "handbag material?" , "Recoil, doc, from the reptile" , "False tears, possibly" , "children in pairs?" , "Reptile - line of schoolchildren" .)