Escape from short holiday in the open air (5,3)
I believe the answer is:
break out
'escape' is the definition.
(breaking out is a kind of escaping)
'short holiday in the open air' is the wordplay.
'short holiday' becomes 'break' (I've seen this before).
'in the open air' becomes 'out' (I can't justify this - if you can you should believe this answer much more).
'break'+'out'='BREAK-OUT'
'from' is the link.
Can you help me to learn more?
(Other definitions for break out that I've seen before include "Appear suddenly - escape" , "Start suddenly; escape (from prison)" , "Escape from jail" .)