Study Hesiod's conclusion in French (3)
I believe the answer is:
den
'study' is the definition.
(term for a study or office)
'hesiod's conclusion in french' is the wordplay.
'conclusion' suggests the final letters.
'in french' becomes 'en' (French word for 'in').
The last letter of 'hesiod' is 'd'.
'd'+'en'='DEN'
(Other definitions for den that I've seen before include "Miserable place" , "Room for work or play" , "Animal's lair or man's study" , "Hideaway" , "Hiding place" .)