Nervous place where teeth may be set? (2,4)
I believe the answer is:
on edge
'nervous' is the definition.
(on edge can mean nervous or tense)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for on edge that I've seen before include "Nervously excited" , "looking down at Much Wenlock?" , "All agog" , "Cliff-top walker may be" , "Fidgety, nervous" .)