Have too much concerning tea production (7)
I believe the answer is:
overeat
'have too much' is the definition.
(I've seen this before)
'concerning tea production' is the wordplay.
'concerning' becomes 'over' (both can mean relating to).
'production' indicates an anagram.
'tea' with letters rearranged gives 'eat'.
'over'+'eat'='OVEREAT'
(Other definitions for overeat that I've seen before include "Stuff oneself silly" , "Indulge in gluttony" , "Consume excessively" , "Be greedy" , "Be gluttonous" .)