Main goal: to be relaxed in the shade (8)
I believe the answer is:
magnolia
'shade' is the definition.
(magnolia is a colour or shade)
'main goal to be relaxed' is the wordplay.
'to be relaxed' indicates anagramming the letters.
'main'+'goal'='maingoal'
'maingoal' anagrammed gives 'MAGNOLIA'.
'in the' acts as a link.
(Other definitions for magnolia that I've seen before include "purplish" , "Miss Hawks in Show Boat" , "Mississippi, the ___ State - tree or shrub" , "Fragrant bloom might strangely gain loam" , "Tree with large scented flowers" .)