Song of praise identified by two articles on mass (6)
I believe the answer is:
anthem
'song of praise' is the definition.
(eg a national anthem)
'two articles on mass' is the wordplay.
'two articles' can mean two replacements for 'article'.
'article' becomes 'an' (indefinite article).
'article' becomes 'the' (the definite article in English).
'on' is a charade indicator (letters next to each other).
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'an'+'the'+'m'='ANTHEM'
'identified by' acts as a link.
(Other definitions for anthem that I've seen before include "Religious chant" , "The man for a rousing song" , "Church choral piece" , "National or religious song" , "The man for a patriotic song" .)