Made merry, when Eddy's almost taken in by rogue (8)
I believe the answer is:
cavorted
'made merry' is the definition.
(I've seen this in another clue)
'eddy's almost taken in by rogue' is the wordplay.
'eddy' becomes 'vortex' (I've seen this in another clue).
'almost' means to remove the last letter (most of the word but not all of it).
'taken in' is an insertion indicator.
'by rogue' becomes 'cad' (I've seen this in another clue. I am not sure about the 'by' bit.).
'vortex' with its last letter taken off is 'vorte'.
'vorte' inserted inside 'cad' is 'CAVORTED'.
'when' acts as a link.
(Another definition for cavorted that I've seen is " Pranced".)