Bury boxes for example, perhaps two or three (7)
I believe the answer is:
integer
'two or three' is the definition.
(I've seen this in another clue)
'bury boxes for example' is the wordplay.
'bury' becomes 'inter' (to inter is to put into the ground).
'boxes' is an insertion indicator (the outside letters must 'box' inside letters in).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'inter' placed around 'eg' is 'INTEGER'.
'perhaps' is the link.
(Other definitions for integer that I've seen before include "Positive or negative whole number" , "A whole number, not a fraction" , "Treeing (anag.)" , "rational number remains" , "one or two, perhaps" .)