Getting excited, hiding a bit (5)
I believe the answer is:
tinge
'a bit' is the definition.
(I've seen this in another clue)
'getting excited hiding' is the wordplay.
'hiding' says the answer is hidden in the clue.
'TINGE' is hidden within 'getting excited'.
(Other definitions for tinge that I've seen before include "Slight colouring" , "Little bit of colour" , "Subdued colour" , "Get in (anag)" , "A slight shade of colour" .)