Adds something against eulogies (11)

I believe the answer is:

contributes

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'adds' is the definition.
('contribute' can be a synonym of 'add')

'against eulogies' is the wordplay.
'against' becomes 'con' (as in pros and cons).
'eulogies' becomes 'tributes' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'con'+'tributes'='CONTRIBUTES'

'something' is the link.
This may not be correct. It may belong to another bit of the clue.

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I've seen this clue in The Guardian.

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