One putting up a fight about close relative (8)

I believe the answer is:

resister

I'm a little stuck... Click here to teach me more about this clue!

'one putting up a fight' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'about close relative' is the wordplay.
'about' becomes 're' (regarding).
'close relative' becomes 'sister' (I've seen this before).
're'+'sister'='RESISTER'

Can you help me to learn more?

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.