Earlier jars of beer (6)
I believe the answer is:
before
'earlier' is the definition.
(synonyms)
'jars of beer' is the wordplay.
'jars' indicates anagramming the letters (the letters must be shocked or jarred).
'of'+'beer'='ofbeer'
'ofbeer' is an anagram of 'BEFORE'.
(Other definitions for before that I've seen before include "In front of (something)" , "In front of or previous to" , "In front - earlier" , "Prior to" , "Previously ? in front" .)