Worker is excited about wage increase (4)
I believe the answer is:
rise
'wage increase' is the definition.
'worker is excited about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'RISE' is hidden in the letters of 'worker is excited'.
(Other definitions for rise that I've seen before include "Salary increase" , "Ascent" , "Tower" , "hike" , "Pay increase" .)