Pinkish (4)
I believe the answer is:
rosy
'pinkish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rosy that I've seen before include "Pinkish; healthy" , "Blooming - hopeful" , "Blushing - optimistic" , "Healthy-looking" , "Promising; hopeful" .)