Siege engine throwing nothing in anger (6)
I believe the answer is:
onager
'siege engine' is the definition.
(I know that Onager is a type of catapult)
'throwing nothing in anger' is the wordplay.
I cannot really see how this works, but
'nothing' could be 'o' (looks like zero - 0) and 'o' is found in the answer.
an anagram of 'anger' is 'nager' which is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for onager that I've seen before include "donkey" , "Asiatic wild ass" , "Orange Asiatic ass" , "ancient weapon" , "Variety of wild ass found in central Asia" .)