Wanting to include tiny creature (3)
I believe the answer is:
ant
'tiny creature' is the definition.
'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 "Six-footer" , "Little boy" , "Termite" , "Hill-dweller" , "Social worker" .)