Crossword Genius

In full agreement, took drug in the morning (2,4)

Ross

I believe the answer is:

ad idem

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'in full agreement' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'took drug in the morning' is the wordplay.
'took' becomes 'did' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'drug' becomes 'e' (E is another name for ecstasy).
'in the' is an insertion indicator.
'morning' becomes 'am' (as in di:00 AM).
'did'+'e'='dide'
'dide' inserted into 'am' is 'AD IDEM'.

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I've seen this clue in The Irish Times.
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