Take off after key provides way out (6)
I believe the answer is:
escape
I believe this is a quadruple definition!!
'take off' is the first definition.
(thesaurus)
'after' acts as a link.
'key' is the second definition.
(key on a keyboard)
'provides' acts as a link.
'way' is the third definition.
(escape is a kind of way)
'out' is the fourth definition.
(thesaurus)
(Other definitions for escape that I've seen before include "An outburst" , "find way out" , "Get away from the strange EC peas" , "Leak; avoid" , "Break loose - flight" .)