Daughter first gets a book reserved (7)
I believe the answer is:
Here is my best explanation:
'reserved' is the definition.
('distant' can be similar in meaning to 'reserved')
'daughter first gets a book' is the wordplay.
'daughter' becomes 'dis' (I've seen this in other clues).
'first' says to put letters next to each other.
'gets a book' becomes 'tant' (I can't explain this - if you can you should believe this answer much more).
(Other definitions for distant that I've seen before include "Absent - coming from a far-away place", "Faraway", "aloof", "overseas?", "Cool", "Far away", "Unfriendly; far off", "cool", "Remote in time or place" and "Aloof".)