Fierce creature? A broken down thing wanting closure (4)
I believe the answer is:
croc
'fierce creature?' is the definition.
'croc' can be an answer for 'creature?' (short for crocodile). I'm unsure of the 'fierce' bit.
'a broken down thing wanting closure' is the wordplay.
I cannot quite see how this works, but
'thing' could be 'roc' (I have seen 'Legendary thing' mean 'roc' so perhaps 'thing' could also mean 'roc') and 'roc' is found in the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for croc that I've seen before include "Long-tailed reptile (abbr)" , "African beast; sounds like piece of pot" , "Dangerous reptile" , "Short reptile" , "Predatory reptile (informal)" .)