One has to do business the best way possible (5)
I believe the answer is:
ideal
'best way possible' is the definition.
'ideal' can be an answer for 'best' (I've seen this before). I'm not certain of the 'way possible' bit.
'one has to do business' is the wordplay.
'one' becomes 'i' (Roman numeral).
'has' means one lot of letters go next to another.
'to do business' becomes 'deal' (as in doing a business deal).
'i'+'deal'='IDEAL'
'the' is the link.
Can you help me to learn more?
(Other definitions for ideal that I've seen before include "A deli (anag.)" , "existing only in imagination" , "Dream" , "Utopian; yardstick" , "An - - Husband (Wilde)" .)