One who circumvents hurdles when discussing terms? (10)
I believe the answer is:
negotiator
'one who circumvents hurdles when discussing terms?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
(Other definitions for negotiator that I've seen before include "One making deal" , "One trying to agree a compromise" , "One in discussions to reach an agreement" , "Bargaining type" , "One may circumvent obstacles" .)