Mention a book about arrest (3)
I believe the answer is:
nab
'arrest' is the definition.
('nab' can be a synonym of 'arrest')
'mention a book about' is the wordplay.
'about' says the answer is hidden in the clue.
'NAB' is hidden within 'mention a book'.
(Other definitions for nab that I've seen before include "Run in" , "Cop" , "Catch (a felon)" , "Catch; grab suddenly" , "nail" .)