One looking for scraps may show it (12)
I believe the answer is:
belligerence
'one looking for scraps' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'show it' is the wordplay.
I cannot quite see how this works, but
'show' could be 'er' (US medical drama) and 'er' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
This explanation may well be incorrect...
'may' acts as a link.
Can you help me to learn more?
(Other definitions for belligerence that I've seen before include "Aggressiveness" , "Pugnacity" , "sabre-rattling" , "Aggressive behaviour" , "Aggression" .)