Getting excited outside, just a bit (5)
I believe the answer is:
tinge
'just a bit' is the definition.
'getting excited outside' is the wordplay.
'outside' indicates the answer is hidden within the clue (a word is around or outside the answer).
'TINGE' is hidden within 'getting excited'.
(Other definitions for tinge that I've seen before include "Slight amount of colour" , "Slight but perceptible amount" , "show a bit of colour ?" , "Get in (anag)" , "A shade or a nuance" .)