Wanting to have worker (3)
I believe the answer is:
ant
'worker' is the definition.
(worker is a type of ant)
'wanting to have' is the wordplay.
'to have' says the answer is hidden in the clue.
'ANT' is hidden within 'wanting'.
(Other definitions for ant that I've seen before include "Worker on the hill" , "maybe in hill" , "One working hard" , "Dec's long-time partner" , "Small busy insect" .)