Nemesis tersely implicates relatives (7)

I believe the answer is:

sisters

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

'relatives' is the definition.
(I know that sis is a type of relatives)

'nemesis tersely implicates' is the wordplay.
'SISTERS' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sisters that I've seen before include "Patient attention required from such" , "Nuns' titles" , "Resists (anag)" , "Aunts may be" , "Members of the family" .)

I've seen this clue in The Irish Times.

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.