Bachelors in action getting sordid (7)
I believe the answer is:
debased
'sordid' is the definition.
(thesaurus)
'bachelors in action' is the wordplay.
'bachelors' becomes 'bas' (people with Bachelor of Arts degrees).
'in' means one lot of letters goes inside another.
'action' becomes 'deed' (deed is a kind of action).
'bas' put within 'deed' is 'DEBASED'.
'getting' acts as a link.
(Other definitions for debased that I've seen before include "Lowered the quality of" , "Lowered in value" , "Adulterated" , "shamed" , "made of lesser value" .)