Bill, having little money, shows stress (6)
I believe the answer is:
accent
'stress' is the definition.
('accent' can be a synonym of 'stress')
'bill having little money' is the wordplay.
'bill' becomes 'ac'.
'having' says to put letters next to each other.
'little money' becomes 'cent' (I've seen this before).
'ac'+'cent'='ACCENT'
'shows' is the link.
(Other definitions for accent that I've seen before include "Distinctive way of pronouncing language" , "Mark over a vowel, perhaps" , "Emphasis on syllable or local pronunciation" , "Here's, maybe, a grave" , "eg Acute" .)