Essentially arguing disco maybe should provide instruction (8)
I believe the answer is:
guidance
'instruction' is the definition.
(I've seen this before)
'essentially arguing disco' is the wordplay.
'essentially' means to look at the middle letters.
'disco' becomes 'dance' (I've seen this in other clues).
The central letters of 'arguing' are 'gui'.
'gui'+'dance'='GUIDANCE'
'maybe should provide' is the 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 guidance that I've seen before include "Help, advice or counselling" , "Help in choice of action" , "Helpful advice" , "Missile component" , "instruction" .)