Big order for lager (5)
I believe the answer is:
large
'big' is the definition.
(synonyms)
'order for lager' is the wordplay.
'order for' is an anagram indicator.
'lager' anagrammed gives 'LARGE'.
(Other definitions for large that I've seen before include "At which criminals possibly are free" , "Lager (anag.)" , "Comprehensive" , "Regal (anag)" , "Massive" .)