Shilling, milliner, shows dash (7)
I believe the answer is:
shatter
'dash' is the definition.
(thesaurus)
'shilling milliner' is the wordplay.
'shilling' becomes 's'.
'milliner' becomes 'hatter' ('hatter' can be a synonym of 'milliner').
's'+'hatter'='SHATTER'
'shows' is the link.
(Other definitions for shatter that I've seen before include "Go to pieces" , "greatly upset" , "Break the minister into little pieces" , "thoroughly upset" , "Threats (anag.)" .)