In which to read that a setback is out of order? (5)
I believe the answer is:
tomes
'in which to read' is the definition.
Although both the answer and 'in' are nouns, they are not in the same form of the noun.
'a setback is out of order?' is the wordplay.
'a setback' becomes 'tes' (I've seen this in other clues).
'is out of' indicates putting letters inside (some letters on the outside of others).
'order?' becomes 'om' (Order of Merit).
'tes' going around 'om' is 'TOMES'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for tomes that I've seen before include "Weighty books" , "Large scholarly books" , "Big books" , "works" .)