Anything a thug can break (5)
I believe the answer is:
aught
'anything' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for aught that I've seen before include "Nothing" , "Anything (Shakespearean)" , "Anything at all (archaic)" , "Emphatically anything" .)