Allowed about nine roughly, to be easy-going (7)
I believe the answer is:
lenient
'easy-going' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'allowed about nine roughly' is the wordplay.
'allowed' becomes 'let' (to let is to allow or permit).
'about' indicates putting letters inside.
'roughly' is an anagram indicator.
'nine' with letters rearranged gives 'nien'.
'let' placed around 'nien' is 'LENIENT'.
'to be' is the link.
Can you help me to learn more?
(Other definitions for lenient that I've seen before include "Indulgent, lax" , "Merciful or easygoing" , "'Indulgent, easy (7)'" , "Clement" , "Showing tolerance" .)