Allowed out of jail, etc. (3)
I believe the answer is:
let
'allowed' is the definition.
(to let is to allow or permit)
'of jail etc' is the wordplay.
'of' says the answer is hidden in the clue.
'LET' is hidden in the letters of 'jail etc'.
'out' is the link.
(Other definitions for let that I've seen before include "Allowed or rented out" , "Permit or rent" , "Allow on the tennis court" , "Was inclined to ignore" , "Award (a contract)" .)