Spot books in Mediterranean resort (6)
I believe the answer is:
notice
'spot' is the definition.
(I've seen this before)
'books in mediterranean resort' is the wordplay.
'books' becomes 'OT' (Old Testament).
'in' indicates putting letters inside.
'mediterranean resort' becomes 'nice' (French city on the Mediterranean).
'ot' going inside 'nice' is 'NOTICE'.
(Other definitions for notice that I've seen before include "Announcement or warning" , "Review - poster" , "Announcement with information about a future event" , "Warning - proclamation" , "Announcement (of the sack?)" .)