Though arguably unyielding, might one go in a bit? (5)
I believe the answer is:
bigot
'though arguably unyielding might one' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'go in a bit?' is the wordplay.
'in' is an insertion indicator.
'go' put into 'bit' is 'BIGOT'.
Can you help me to learn more?
(Other definitions for bigot that I've seen before include "Fanatic" , "sectarian" , "Deeply prejudiced and intolerant person" , "Intolerant type" , "Someone intolerant of opinions of others" .)