Objected to work; took up modelling (7)

I believe the answer is:

opposed

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'objected to' is the definition.
(I've seen this before)

'work took up modelling' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'took' means one lot of letters go next to another.
'up modelling' becomes 'posed' (I can't explain this - if you can you should believe this answer much more).
'op'+'posed'='OPPOSED'

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(Other definitions for opposed that I've seen before include "Stood against" , "Withstood" , "Objected to" , "Anti" , "Resisted" .)

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

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