Dilatory perhaps but performed with skill (8)
I believe the answer is:
adroitly
'with skill' is the definition.
(I've seen this in another clue)
'dilatory perhaps' is the wordplay.
'perhaps' indicates an anagram.
'dilatory' with letters rearranged gives 'ADROITLY'.
'but performed' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for adroitly that I've seen before include "Quickly and skilfully" , "With dexterity" , "With deftness" , "far from clumsily" , "With skill - dilatory (anag)" .)