Concerning lager order - it's 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' is an anagram of 'large'.
'over'+'large'='OVERLARGE'
'it's' acts as a link.
(Other definitions for overlarge that I've seen before include "not the right size" , "more than enough" , "Too big" , "not as small as required?" , "Excessive" .)