Crossword Genius

Unearned income? (6,3)

Ross

I believe the answer is:

strike pay

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'unearned income?' is the definition.
The answer and definition can be both related to property as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

This is the entire clue.

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(Other definitions for strike pay that I've seen before include "it's paid to those not acting?" , "Money for those taking industrial action" .)

I've seen this clue in The Globe and Mail.
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