On application obtain perhaps licence to kill (4,3)
I believe the answer is:
take out
I believe this clue is a double definition.
'on application obtain perhaps licence' is the first definition.
(as in taking out a licence)
'kill' is the second definition.
(I've seen this before)
'to' is the link.
(Other definitions for take out that I've seen before include "As gangster, kill" , "Extract; kill" , "kebab, perhaps" , "Kill (colloq.)" , "Remove; escort" .)