Current transaction, visionary (5)
I believe the answer is:
ideal
'visionary' is the definition.
(synonyms)
'current transaction' is the wordplay.
'current' becomes 'I' (physics symbol).
'transaction' becomes 'deal' (a deal is a transaction or exchange).
'i'+'deal'='IDEAL'
(Other definitions for ideal that I've seen before include "Something that one hopes to attain" , "Model of perfection" , "(the best one can get)" , "Just perfect, couldn't be better" , "To which one aspires" .)