Brewery sight (3)
I believe the answer is:
vat
'brewery sight' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vat that I've seen before include "subject of 17, 8 [CHANCELLORS STATEMENT]" , "Deep tank or tax duty" , "Large tank; purchase tax" , "Tank for holding liquids" , "Barrel - tax" .)