Metal, it’s brought up North (3)
I believe the answer is:
'metal' is the definition.
(I know that tin is a type of metal)
'it's brought up north' is the wordplay.
'it's' becomes 'it' (I can't justify this - if you can you should give a lot more credence to this answer).
'brought up' is a reversal indicator (in a down clue, letters go up).
'north' becomes 'N' (abbreviation).
'it' backwards is 'ti'.
Can you help me to learn more?
(Other definitions for tin that I've seen before include "Silvery metallic element" , "Silvery-white metallic element" , "Silver-white metal, used to make cans" , "Atomic number 50" , "Element, symbol Sn" .)