Element of language on page? I'm not sure (8)
I believe the answer is:
platinum
'element' is the definition.
(platinum is a kind of element)
'language on page? i'm not sure' is the wordplay.
'language' becomes 'latin' (Latin is an example).
'on' is a charade indicator (letters next to each other).
'page?' becomes 'p'.
'i'm not sure' becomes 'um' (expression of hesitation).
'latin' after 'p' is 'platin'.
'platin'+'um'='PLATINUM'
'of' acts as a link.
(Other definitions for platinum that I've seen before include "Precious metal, Pt" , "Atomic number 78" , "Heavy white metal" , "12 down metal" , "Valuable stuff, after a grind" .)