One can be dressed, just like a jack-in-the-box! (5)
I believe the answer is:
wound
'a jack-in-the-box' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'one can be dressed just' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'un' (northern English dialect form of 'one') and 'un' is found within the answer.
This explanation may well be incorrect...
'like' is the link.
Can you help me to learn more?
(Other definitions for wound that I've seen before include "As bandage was" , "Cause injury to" , "lesion?" , "wrapped" , "injury to reputation" .)