Work-place adversaries (10)

I believe the answer is:

opposition

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'work-place adversaries' is the definition.
I can't tell whether this definition defines the answer.

'work-place' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'place' becomes 'position' (positioning is a kind of placing**).
'op'+'position'='OPPOSITION'

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

I've seen this clue in the Evening Standard.

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