Crossword Genius

Wound up hem here? (2,4)

Ross

I believe the answer is:

on edge

I'm a little stuck... Click here to teach me more about this clue!

'wound up' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'hem here?' is the wordplay.
I cannot really understand how this works, but
'hem' could be 'edge' (I've seen this before) and 'edge' is found within the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for on edge that I've seen before include "'Tense, nervous (2,4)'" , "Tense and irritable, with nerves stretched" , "Highly strung" , "Nervously excited" , "Twitchy" .)

I've seen this clue in The Times.
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