Spider being fed with last bits of Australian fruit flies (8)
I believe the answer is:
huntsman
'spider' is the definition.
(family of giant spiders)
'being fed with last bits of australian fruit flies' is the wordplay.
'being' becomes 'human' (human is a kind of being).
'fed with' means one lot of letters goes inside another.
'last bits of' says to take the final letters.
The last letters of 'australian fruit flies' are 'nts'.
'human' placed around 'nts' is 'HUNTSMAN'.
(Other definitions for huntsman that I've seen before include "One riding to hounds" , "One pursuing animals for sport" , "One chasing quarry" , "Who cares for hounds" .)