Vagrants will accept European Commission gets better (8)
I believe the answer is:
recovers
'gets better' is the definition.
('recover' can be a synonym of 'get better')
'vagrants will accept european commission' is the wordplay.
'vagrants' becomes 'rovers'.
'will accept' means one lot of letters goes inside another.
'european commission' becomes 'ec'.
'rovers' going around 'ec' is 'RECOVERS'.
(Other definitions for recovers that I've seen before include "Returns to good health" , "rallies" , "Gets over an illness" , "Gets better or gets back" .)