We lend coinage for bridging tooth, it's a bit gimmicky (10)
I believe the answer is:
newfangled
'gimmicky' is the definition.
Both the answer and definition are adjectives.
Perhaps you can see a link between them that I don't see?
'we lend coinage for bridging tooth it's a bit' is the wordplay.
I cannot quite see how this works, but
'tooth' could be 'fang' (fang is a kind of tooth) and 'fang' is found in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for newfangled that I've seen before include "on the bleeding edge?" , "like nothing seen before" , "Recent" , "(Unnecessarily) different from what one is used to" , "Modern and familiar" .)