Ace was crossing road to get prizes (6)
I believe the answer is:
awards
'prizes' is the definition.
('award' can be a synonym of 'prize')
'ace was crossing road' is the wordplay.
'ace' becomes 'a' (abbreviation).
'crossing' indicates putting letters inside (to cross can mean to go over or around).
'road' becomes 'rd' (abbreviation).
'was' enclosing 'rd' is 'wards'.
'a'+'wards'='AWARDS'
'to get' acts as a link.
(Other definitions for awards that I've seen before include "Tony and Oscar perhaps" , "Glorifying gongs" , "Gives as official payment or prize" , "Prizes found in a sad war, strangely" , "Prizes and trophies" .)