Wanting to include creature (3)
I believe the answer is:
ant
'creature' is the definition.
(ant is a kind of animal)
'wanting to include' is the wordplay.
'to include' indicates a hidden word.
'ANT' can be found hidden inside 'wanting'.
(Other definitions for ant that I've seen before include "Industrious insect" , "One more provident than Grasshopper" , "Hill-dweller" , "Small social insect" , "The insect lives in a social colony" .)