Classical man academically pens annual publication (7)
I believe the answer is:
almanac
'annual publication' is the definition.
(I've seen this before)
'classical man academically pens' is the wordplay.
'pens' indicates a hidden word (pen can mean to contain or cage).
'ALMANAC' is hidden in the letters of 'classical man academically'.
(Other definitions for almanac that I've seen before include "periodic publication" , "Calendar with detailed information" , "Annual list of dates" , "issue every year" , "Calendar with astronomical data and other information" .)