Being pious about me is commonplace (6)
I believe the answer is:
homely
'commonplace' is the definition.
(thesaurus)
'being pious about me' is the wordplay.
'being pious' becomes 'holy' (both mean religious).
'about' is an insertion indicator.
'holy' enclosing 'me' is 'HOMELY'.
'is' is the link.
(Other definitions for homely that I've seen before include "Unpretentious, domesticated" , "Simple and informal, not pretentious" , "Plain and simple - sounds domestic" , "Modest" , "Plain and simple, not pretentious" .)