Bungling leader missed a French deity (7)
I believe the answer is:
neptune
'deity' is the definition.
(I know that Neptune is a Roman deity)
'bungling leader missed a french' is the wordplay.
I cannot really see how this works, but
'leader' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
'a french' could be 'une' ('a' in French) and 'une' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for neptune that I've seen before include "revolutionary body" , "Sea god - outer planet" , "Roman god of the sea, with trident" , "Poseidon" , "Roman sea-god" .)