Huge vats are ordered (4)
I believe the answer is:
vast
'huge' is the definition.
(I know that huge can be written as vast)
'vats are ordered' is the wordplay.
'are ordered' indicates an anagram.
'vats' is an anagram of 'VAST'.
(Other definitions for vast that I've seen before include "Gigantic" , "'Huge, immense (4)'" , "Of very great extent" , "Boundless" , "Unusually great" .)