Tried with difficulty to get guys to agree, causing harm (13)

I believe the answer is:

detrimentally

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'tried with difficulty to get guys to agree causing harm' is the definition.
I can't judge whether this defines the answer.

'tried with difficulty to get guys to agree' is the wordplay.
'with difficulty' is an anagram indicator.
'to get' means one lot of letters go next to another.
'guys' becomes 'men'.
'to agree' becomes 'tally' ('tally' can be a synonym of 'agree'**).
'tried' anagrammed gives 'detri'.
'detri'+'men'+'tally'='DETRIMENTALLY'

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(Another definition for detrimentally that I've seen is " In a damaging manner".)

I've seen this clue in The Telegraph.

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