Large reptile with long jaws (9)
I believe the answer is:
crocodile
'large reptile with long jaws' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for crocodile that I've seen before include "children in pairs?" , "handbag material?" , "Old Cicero, oddly, was a voracious reptile" , "Insincere show of sorrow" , "Recoil, doc, from the reptile" .)