Dead ant less filling, one feeds on termites (6)
I believe the answer is:
numbat
'one feeds on termites' is the definition.
I can't judge whether this definition defines the answer.
'dead ant less filling' is the wordplay.
'dead' becomes 'numb' (as in a dead arm).
'less filling' suggests removing the centre (letters which fill the word are removed).
'ant' with its centre removed is 'at'.
'numb'+'at'='NUMBAT'
Can you help me to learn more?
(Other definitions for numbat that I've seen before include "one bright-eyed and bushy-tailed?" , "Australian native" , "Termite-eating marsupial" , "insectivore" .)