... before real ire is dissipated (7)
I believe the answer is:
earlier
'before' is the definition.
('earlier' can be a synonym of 'before')
'real ire is dissipated' is the wordplay.
'is dissipated' is an anagram indicator.
'real'+'ire'='realire'
'realire' with letters rearranged gives 'EARLIER'.
(Other definitions for earlier that I've seen before include "At a previous time" , "Prior" , "(Happening) before in time" , "Former" , "in days of yore?" .)