Two for one for example in Bury (7)
I believe the answer is:
integer
'two for one' is the definition.
(two is a kind of integer)
'example in bury' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'in' means one lot of letters goes inside another.
'bury' becomes 'inter' (synonyms).
'eg' going inside 'inter' is 'INTEGER'.
'for' is the link.
(Other definitions for integer that I've seen before include "Positive or negative whole number" , "rational number remains" , "The whole thing" , "one or two, perhaps" , "Treeing (anag.)" .)