Ration Enid distributed is excessive (10)
I believe the answer is:
inordinate
'excessive' is the definition.
(I know that excessive can be written as inordinate)
'ration enid distributed' is the wordplay.
'distributed' indicates an anagram.
'ration'+'enid'='rationenid'
'rationenid' anagrammed gives 'INORDINATE'.
'is' is the link.
(Other definitions for inordinate that I've seen before include "Unusually large" , "disorderly" , "Excessive" .)