Get away with key? (6)
I believe the answer is:
escape
I believe this is a double definition.
'get away' is the first definition.
(synonyms)
'key?' is the second definition.
(key on a keyboard)
'with' is the link.
(Other definitions for escape that I've seen before include "sometimes made by prisoners" , "issue" , "Evade" , "A key at top, on left" , "Elude, dodge" .)