The emphasis on current cash (6)
I believe the answer is:
accent
'the emphasis' is the definition.
(synonyms)
'on current cash' is the wordplay.
'on' is a charade indicator (letters next to each other).
'current' becomes 'ac' (alternating current).
'cash' becomes 'cent'.
'ac'+'cent' is 'ACCENT'.
(Other definitions for accent that I've seen before include "pitch" , "Distinctive manner of oral expression" , "Particular emphasis" , "It could be acute" , "Emphasis on syllabus or word" .)