Change distribution of ale ration around end of August (10)
I believe the answer is:
alteration
'change' is the definition.
(alteration is a kind of change)
'distribution of ale ration around end of august' is the wordplay.
'distribution of' indicates anagramming the letters.
'around end of' says to take the final letters.
The final letter of 'august' is 't'.
'ale'+'ration'+'t'='alerationt'
'alerationt' anagrammed gives 'ALTERATION'.
(Other definitions for alteration that I've seen before include "Adjustment" , "Change" , "Amendment" .)