Stress Bill associated with money (6)
I believe the answer is:
accent
'stress' is the definition.
(accent can mean to emphasise or stress)
'bill associated with money' is the wordplay.
'bill' becomes 'ac' (short for account).
'associated with' means one lot of letters go next to another.
'money' becomes 'cent' (eg denomination of dollars).
'ac'+'cent'='ACCENT'
(Other definitions for accent that I've seen before include "A localised way of speaking" , "feature of dialect?" , "Local way of speaking or enunciation" , "Particular emphasis" , "it could be grave" .)