Give instructions on a key way for a storage box (3,5)
I believe the answer is:
tea chest
'a storage box' is the definition.
'tea chest' can be an answer for 'box' (tea chest is a kind of box). I'm unsure of the 'a storage' bit.
'give instructions on a key way' is the wordplay.
'give instructions on' becomes 'teach' (I can't justify this - if you can you should give a lot more credence to this answer).
'a key' becomes 'e' (I've seen this in other clues).
'way' becomes 'st' (abbreviation for street).
'teach'+'e'+'st'='TEA-CHEST'
'for' is the link.
Can you help me to learn more?
(Other definitions for tea chest that I've seen before include "Leaves boxing" , "Item famously thrown overboard" , "Metal lined container" , "Light metal-lined box for transportation" , "box of gunpowder, say" .)