Take back what you said about a pamphlet (7)
I believe the answer is:
retract
'take back' is the definition.
(thesaurus)
'about a pamphlet' is the wordplay.
'about' becomes 're' (regarding).
'a pamphlet' becomes 'tract' ('tract' can be a synonym of 'pamphlet').
're'+'tract'='RETRACT'
'what you said' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for retract that I've seen before include "Withdraw as unjustified" , "Pull back (statements or claws, perhaps)" , "Cancel" , "Withdraw (offer, statement etc)" , "Withdraw one's statement" .)