Fresh head of lettuce after fifteen days? (5)
I believe the answer is:
novel
'fresh' is the definition.
(I know that fresh can be written as novel)
'head of lettuce after fifteen days?' is the wordplay.
'head of' indicates taking the first letters.
'after' says to put letters next to each other.
'fifteen days?' becomes 'nove' (I can't explain this - if you can you should believe this answer much more).
The initial letter of 'lettuce' is 'l'.
'l' put after 'nove' is 'NOVEL'.
Can you help me to learn more?
(Other definitions for novel that I've seen before include "She, for example" , "Book of prose fiction" , "Volume of prose fiction" , "Fictional work" , "literary work" .)