Relaxed as Left must have help and support (4,4)
I believe the answer is:
laid back
'relaxed' is the definition.
(similar in meaning)
'left must have help and support' is the wordplay.
'left' becomes 'l' (common abbreviation).
'must have' means one lot of letters go next to another.
'help' becomes 'aid' (synonyms).
'and' is a charade indicator (letters next to each other).
'support' becomes 'back' (backing is a kind of supporting).
'l'+'aid'+'back'='LAID-BACK'
'as' acts as a link.
(Other definitions for laid back that I've seen before include "Disinclined to make effort" , "not affected by pressure?" , "Relaxed" .)