Emphatically rosy (5)
I believe the answer is:
ruddy
'rosy' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ruddy that I've seen before include "Rubicund" , "Reddish; -- duck" , "Damned - healthy" , "Looking healthy" , "Having a healthy red complexion" .)