Curl up with a good book, say (4)
I believe the answer is:
read
I believe this is a double definition.
'curl up with a good book' is the first definition.
(I've seen this in another clue)
'say' is the second definition.
(I know that say can be written as read)
(Other definitions for read that I've seen before include "Lecture" , "Studied" , "what follows 18 [OMASUM] in a 17 [RUMINANT]" , "Looked at and understood" , "Interpret (text)" .)