Bound or secured (4)
I believe the answer is:
tied
I believe this clue is a double definition.
'bound' is the first definition.
(similar in meaning)
'secured' is the second definition.
(tying is a kind of securing)
(Other definitions for tied that I've seen before include "Fastened, bound" , "Drawn" , "Bonded" , "(Of pub) controlled by a brewery" , "(Of pub) brewery-owned" .)