Be tediously persistent as battleaxe (6)
I believe the answer is:
dragon
'battleaxe' is the definition.
(I've seen this before)
'be tediously persistent' is the wordplay.
I cannot quite understand how this works, but
'be' could be 'go' (going is a kind of being) and 'go' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'as' acts as a link.
Can you help me to learn more?
(Other definitions for dragon that I've seen before include "particularly intimidating woman" , "Legendary fire-breather" , "Fire-breathing, winged mythical monster" , "St George's slew one" , "Fire-breathing creature slain by St George" .)