Take back tons wagoner brought up (7)
I believe the answer is:
retract
'take back' is the definition.
(thesaurus)
'tons wagoner brought up' is the wordplay.
'tons' becomes 't'.
'wagoner' becomes 'carter' (I've seen this before).
'brought up' says the letters should be written in reverse (down clues only).
't'+'carter'='tcarter'
'tcarter' in reverse letter order is 'RETRACT'.
(Other definitions for retract that I've seen before include "Reverse" , "Abjure" , "Withdraw, take back" , "Withdraw (offer, statement etc)" , "Cancel" .)