Stocks cushion wife dismissed on line (7)
I believe the answer is:
pillory
'stocks' is the definition.
(synonyms)
'cushion wife dismissed on line' is the wordplay.
'cushion' becomes 'pillow' (pillow is a kind of cushion).
'wife' becomes 'w' (abbreviation).
'dismissed' indicates named letters should be taken away.
'on' is a charade indicator (letters next to each other).
'line' becomes 'ry' (abbreviation for railway).
'pillow' with 'w' removed is 'pillo'.
'pillo'+'ry'='PILLORY'
(Other definitions for pillory that I've seen before include "place of punishment" , "Expose to public derision" , "Publicly ridicule" , "Assail; old punishment frame" , "Expose to public ridicule" .)