Collection of books in support of refuge for pauper (4-3)
I believe the answer is:
have-not
'pauper' is the definition.
(I've seen this before)
'collection of books in support of refuge' is the wordplay.
'collection of books' becomes 'ot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in support of' means one lot of letters go next to another (in a down clue, some letters hold up others).
'refuge' becomes 'haven' (I've seen this before).
'ot' after 'haven' is 'HAVE-NOT'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for have-not that I've seen before include "Economically disadvantaged person" , "Poor person" , "Someone with meagre possessions" , "Person of little material wealth" , "Someone who lacks possessions" .)