Being natural, some biting insect? (4)
I believe the answer is:
gnat
'biting insect?' is the definition.
(I've seen this before)
'being natural some' is the wordplay.
'some' indicates the answer is hidden within the clue.
'GNAT' is hidden within 'being natural'.
(Other definitions for gnat that I've seen before include "Tiny biting insect" , "Small biter" , "mozzie" , "Insect often hovering over stagnant water" , "Tang (anag.)" .)