Want to include worker (3)
I believe the answer is:
ant
'worker' is the definition.
(worker is a type of ant)
'want to include' is the wordplay.
'include' indicates a hidden word.
'ANT' is hidden in the letters of 'want to'.
(Other definitions for ant that I've seen before include "Proverbially hard-working insect" , "Hill-dweller" , "maybe in hill" , "Little boy" , "Industrious insect" .)