Easy-going (8)
(Other definitions for amiable that I've seen before include "Friendly and good-natured (7)" , "'Friendly, pleasant and good-tempered (7)'" , "Good-humoured" , "Of sweet and friendly disposition" , "'Cordial, friendly (7)'" .)
(Other definitions for affable that I've seen before include "Pleasantly friendly" , "Obliging" , "Pleasant to talk to" , "Easy to talk to" , "Amiable, genial" .)
'easy-going' is the definition.
(lenient can mean easy-going or relaxed)
This is all the clue.
(Other definitions for lenient that I've seen before include "Forgiving, soft" , "Compassionate" , "Forbearing" , "Showing tolerance" , "Not severe in punishing" .)
'easy-going' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for relaxed that I've seen before include "Having put one's feet up" , "Chilled; made less strict" , "Slackened" , "Rested" , "Became less tense and more at ease" .)
'easy-going' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for laid-back that I've seen before include "Unhurried and relaxed" , "Relaxed (colloq.)" , "Ultra-cool!" , "Easygoing and relaxed like cabal kid" .)
(Other definitions for genial that I've seen before include "'Cheerful, friendly, sociable (6)'" , "Cordial" , "Agreeable in Ealing" , "Cheerful and well-disposed" , "relating to the chin" .)
(Other definitions for informal that I've seen before include "Unofficial, relaxed" , "If normal, be casual and without ceremony" , "Cosy -- loose" , "Casual or unofficial" , "Casual, not official" .)