Crossword Genius

Personal issue of saline solution (5)

Ross

I believe the answer is:

sweat

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This could be a double definition.

'personal issue' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'saline solution' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for sweat that I've seen before include "(Of argument) intense" , "Soldier" , "Salty fluid secreted by glands" , "Toil" , "Salty fluid secreted by the body" .)

I've seen this clue in the Evening Standard.
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