Means of escape (3)
'means of escape' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for out that I've seen before include "At fault - dismissed" , "in the shops" , "(Of a flower) open" , "Defeated" , "Walking back to the pavilion" .)
I believe this is a double definition.
'means' is the first definition.
(I have seen 'Means of release' mean 'outlet' so perhaps 'means' could also mean 'outlet')
'escape' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for outlet that I've seen before include "Means of release" , "Discharge pipe" , "Vent for water or feelings" , "Retail point" , "Means or occasion for giving vent to feelings" .)