One chapter in literature, OK? (5)
I believe the answer is:
licit
'ok?' is the definition.
(I've seen this in another clue)
'one chapter in literature' is the wordplay.
'one chapter' becomes 'ci' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'literature' becomes 'lit' (abbreviation).
'ci' put within 'lit' is 'LICIT'.
Can you help me to learn more?
(Other definitions for licit that I've seen before include "Allowable" , "OK?" , "Legitimate" , "Within the law" , "Sanctioned" .)