Backing achieved today (3)
I believe the answer is:
now
'today' is the definition.
(synonyms)
'backing achieved' is the wordplay.
'backing' shows that the letters should be reversed in order.
'achieved' becomes 'won' (win can mean to earn or achieve).
'won' back-to-front is 'NOW'.
(Other definitions for now that I've seen before include "straight away" , "At this moment in time" , "At present, this instant" , "Immediately" , "The present moment" .)