Brew of beer left to rise (5)
I believe the answer is:
rebel
'rise' is the definition.
('rebel' can be a synonym of 'rise')
'brew of beer left' is the wordplay.
'brew of' indicates anagramming the letters (I've seen this in other clues).
'left' becomes 'l' (common abbreviation).
'beer' is an anagram of 'rebe'.
'rebe'+'l'='REBEL'
'to' acts as a link.
(Other definitions for rebel that I've seen before include "He resists authority" , "Revolting person" , "Non-conformist" , "Do things differently" , "One who opposes the powerful" .)