Crossword Genius

Complaint affecting setter? (9)

Ross

I believe the answer is:

distemper

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

This might be a double definition.

'complaint' is the first definition.
(distemper is a kind of disease)

'affecting setter?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for distemper that I've seen before include "Paint; canine disease" , "bad state, being old" , "problem for pet" , "Paint - dog disease" , "Viral disease" .)

I've seen this clue in The Telegraph.
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