Collection of keys I sort in the van (10)
I believe the answer is:
typewriter
'collection' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'keys i sort in the van' is the wordplay.
'keys i' becomes 'writer' (I can't justify this - if you can you should give a lot more credence to this answer).
'sort' becomes 'type' (type is a kind of sort).
'in the van' means one lot of letters go next to another (some letters go in the van ie at the front).
'writer' put after 'type' is 'TYPEWRITER'.
'of' is the link.
Can you help me to learn more?
(Other definitions for typewriter that I've seen before include "printing machine" , "Former secretarial tool" , "Longest word obtainable using only the top line of a normal keyboard" , "Hand-operated printer" , "Machine superseded by the word processor" .)