Help bishop in need to be easy-going (4-4)
I believe the answer is:
laid-back
'be easy-going' is the definition.
('laid-back' can be a synonym of 'easy-going')
'help bishop in need' is the wordplay.
'help' becomes 'aid' ('aid' can be a synonym of 'help'**).
'bishop' becomes 'b' (abbreviation used in chess).
'in' means one lot of letters goes inside another.
'need' becomes 'lack' (to lack something is to be in need of it).
'aid'+'b'='aidb'
'aidb' going within 'lack' is 'LAID-BACK'.
'to' is the link.
(Other definitions for laid-back that I've seen before include "Unhurried and relaxed" , "Ultra-cool!" , "Easygoing and relaxed like cabal kid" , "Relaxed (colloq.)" .)