Crossword Genius

It's of benefit to a survivor (6)

Ross

I believe the answer is:

legacy

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

'survivor' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for legacy that I've seen before include "Bombay since 1995" , "Heritage" , "Gift left in will" , "What is left to one in will" , "Money left" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app