Concerning lager order - too big (9)
I believe the answer is:
overlarge
'too big' is the definition.
(I've seen this before)
'concerning lager order' is the wordplay.
'concerning' becomes 'over' (both can mean relating to).
'order' indicates anagramming the letters.
'lager' anagrammed gives 'large'.
'over'+'large'='OVERLARGE'
(Other definitions for overlarge that I've seen before include "Excessive" , "more than enough" , "Titanic" , "not the right size" , "Too big" .)