Bachelors embracing Queen supporters (4)
I believe the answer is:
bras
'supporters' is the definition.
(a bra gives support to breasts)
'bachelors embracing queen' is the wordplay.
'bachelors' becomes 'bas' (people with Bachelor of Arts degrees).
'embracing' indicates putting letters inside.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'bas' enclosing 'r' is 'BRAS'.
(Other definitions for bras that I've seen before include "They support" , "intimate garments" , "Items in womenswear" , "Female undergarments" , "supports" .)