Crossword Genius

Workplace for one's competitors (10)

Ross

I believe the answer is:

opposition

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

'workplace' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'one's competitors' is the wordplay.
I cannot quite understand how this works, but
'one's' could be 'os' (I've seen this in other clues) and 'os' is found within the answer.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?

(Other definitions for opposition that I've seen before include "Rivalry" , "Resistance, dissent" , "antagonism" , "organized political group" , "Political party" .)

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