Obstruction in pub with adult brewing cider outside (9)
I believe the answer is:
barricade
'obstruction' is the definition.
(I know that barricade is a type of boom barrier)
'pub with adult brewing cider outside' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'with' is a charade indicator (letters next to each other).
'adult' becomes 'a' (abbreviation).
'brewing' indicates anagramming the letters.
'outside' is an insertion indicator.
'cider' anagrammed gives 'ricde'.
'a' put inside 'ricde' is 'ricade'.
'bar'+'ricade'='BARRICADE'
'in' is the link.
(Other definitions for barricade that I've seen before include "Temporary blockage to obstruct movement" , "Improvised obstruction" , "Defend" , "close up" , "Improvised fence" .)