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' says the answer is hidden in the clue.
'ANT' is hidden in the letters of 'wanting'.
(Other definitions for ant that I've seen before include "Six-footer" , "Little boy" , "Termite" , "Hill-dweller" , "Social worker" .)