In a perfect world, setter would lead enterprise with supporter (7)
I believe the answer is:
ideally
'in a perfect world' is the definition.
(in an ideal world)
'setter would lead enterprise with supporter' is the wordplay.
'setter would' becomes 'i'd' (I would, referring to the person setting the clues).
'lead' means one lot of letters go next to another.
'enterprise' becomes 'e' (this could be a standard abbreviation of which I'm unaware).
'with' says to put letters next to each other.
'supporter' becomes 'ally' (an ally is a friend or supporter).
'id'+'e'+'ally'='IDEALLY'
Can you help me to learn more?
(Other definitions for ideally that I've seen before include "In perfect circumstances" , "Lay idle (anag)" , "In the best of all possible worlds" , "Perfectly; most suitably" , "In the most perfect way" .)