Mere agents might make them (10)
I believe the answer is:
'them' is the definition.
I can't judge whether this definition defines the answer.
'mere agents might make' is the wordplay.
'might make' indicates an anagram (the letters might make if rearranged).
'mereagents' with letters rearranged gives 'AGREEMENTS'.
Can you help me to learn more?
(Other definitions for agreements that I've seen before include "Compromises in" , "pledges" , "Concerts" , "contracts" .)