Support English prior (6)
I believe the answer is:
before
'prior' is the definition.
(synonyms)
'support english' is the wordplay.
'support' becomes 'be for' (to be for something is to support it).
'english' becomes 'E' (abbreviation).
'befor'+'e'='BEFORE'
(Other definitions for before that I've seen before include "Earlier than something" , "Defy, withstand" , "In sight of" , "Prior to" , "In front of (something)" .)