Did business in ideal terms (5)
I believe the answer is:
dealt
'did business' is the definition.
(I've seen this in another clue)
'in ideal terms' is the wordplay.
'in' says the answer is hidden in the clue.
'DEALT' can be found hidden inside 'ideal terms'.
(Other definitions for dealt that I've seen before include "Distributed playing cards" , "Carried out business" , "Handed out (cards)" , "Dispensed (cards)" , "Doled out" .)