embarrassed, being a bit tight perhaps (13)
I believe the answer is:
uncomfortable
I believe this is a double definition.
'embarrassed' is the first definition.
(thesaurus)
'a bit tight perhaps' is the second definition.
(as in uncomfortable clothing)
'being' acts as a link.
(Other definitions for uncomfortable that I've seen before include "Ill-fitting" , "Awkward - embarrassed" , "Disquieted" , "being out of place" , "Uneasy, awkward" .)