Bury hosting guide on vacation number two? (7)
I believe the answer is:
integer
'number two?' is the definition.
'integer' can be an answer for 'two?' (two is a kind of integer). I'm not sure about the 'number' bit.
'bury hosting guide on vacation' is the wordplay.
'bury' becomes 'inter' (to inter is to put into the ground).
'hosting' is an insertion indicator (inserted letters are welcomed in or hosted).
'on vacation' says to hollow out the word (remove centre letters) (after the inside letters have vacated the word).
'guide' with its centre taken out is 'ge'.
'inter' placed around 'ge' is 'INTEGER'.
Can you help me to learn more?
(Other definitions for integer that I've seen before include "one or two, perhaps" , "Say one" , "Result of counting" , "Gin tree (anag)" , "rational number remains" .)