Nervous in a situation where cliff may collapse? (2,4)
I believe the answer is:
on edge
'nervous' is the definition.
(thesaurus)
'a situation where cliff may collapse?' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'one' and 'one' is present in the answer.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for on edge that I've seen before include "Anxious, nervy" , "Tense and irritable, with nerves stretched" , "'Tense, nervous (2,4)'" , "looking down at Much Wenlock?" , "Nervous and tense - close to cliff?" .)