Number, say, encountered in Bury (7)
I believe the answer is:
integer
'number' is the definition.
(integer is a kind of number)
'say encountered in bury' is the wordplay.
'say' becomes 'eg'.
'encountered in' indicates putting letters inside.
'bury' becomes 'inter' (I've seen this before).
'eg' inserted within 'inter' is 'INTEGER'.
(Other definitions for integer that I've seen before include "One for example" , "Positive or negative whole number" , "Whole unit" , "Gin tree (anag)" , "rational number remains" .)