Get better price after union throws creep out (10)
I believe the answer is:
recuperate
'get better' is the definition.
(synonyms)
'price after union throws creep out' is the wordplay.
'price' becomes 'rate' (I've seen this in other clues).
'after' is a charade indicator (letters next to each other).
'union' becomes 'U' (common abbreviation as in Trades Union Congress).
'throws' indicates anagramming the letters.
'out' indicates putting letters inside.
'creep' with letters rearranged gives 'recpe'.
'u' going into 'recpe' is 'recupe'.
'rate' after 'recupe' is 'RECUPERATE'.
(Other definitions for recuperate that I've seen before include "Rally, recover" , "Convalesce" , "Recover from an illness" , "Get better" .)