He's very good at taking precedence (5)
I believe the answer is:
prior
'he's very good at taking precedence' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for prior that I've seen before include "Former - head of religious house" , "Previous; deputy abbot" , "Source of poetry in 17th century" , "Previous; abbot's deputy" , "Former - chief of religious house" .)