Beneficiary from shelter crossing northern street (7)
I believe the answer is:
legatee
'beneficiary' is the definition.
(legatee is a kind of beneficiary)
'shelter crossing northern street' is the wordplay.
'shelter' becomes 'lee' (I've seen this before).
'crossing' means one lot of letters goes inside another.
'northern street' becomes 'gate' (I can't explain this - if you can you should believe this answer much more).
'lee' going around 'gate' is 'LEGATEE'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for legatee that I've seen before include "One who gains benefits" , "man newly-enriched?" , "One receiving a bequest" , "One coming into property" , "One benefiting from a will" .)