The rep takes a mere flip through the contract (9)
I believe the answer is:
agreement
'the contract' is the definition.
(a contract is a legal agreement)
'the rep takes a mere flip' is the wordplay.
'the rep' becomes 'agent' (I've seen this before).
'takes' indicates putting letters inside.
'flip' is an anagram indicator (I've seen 'flips' mean this).
'mere' with letters rearranged gives 'reem'.
'agent' enclosing 'reem' is 'AGREEMENT'.
'through' acts as a link.
(Other definitions for agreement that I've seen before include "understanding" , "deal" , "Harmony of opinion" , "State of being consistent" , "Concord, harmony" .)