Massage image showing point of no return (7)
I believe the answer is:
rubicon
'point of no return' is the definition.
('Rubicon' can be a synonym of 'point of no return')
'massage image' is the wordplay.
'massage' becomes 'rub' (I've seen this before).
'image' becomes 'icon' ('icon' can be a synonym of 'image').
'rub'+'icon'='RUBICON'
'showing' is the link.
(Other definitions for rubicon that I've seen before include "Caesar got over this" , "River symbolically crossed" , "What's important to cross" , "River crossed by Caesar in decisive move" , "Caesar's fateful river" .)