Supports for the last roses to come out (8)
I believe the answer is:
endorses
'supports' is the definition.
('endorse' can be a synonym of 'support')
'the last roses to come out' is the wordplay.
'the last' becomes 'end'.
'to come out' indicates anagramming the letters.
'roses' anagrammed gives 'orses'.
'end'+'orses'='ENDORSES'
'for' acts as a link.
(Other definitions for endorses that I've seen before include "Gives support or approval to" , "'Supports, backs (8)'" , "Approves, supports" , "One dress (anag.)" , "Countersigns, approves" .)