Study conclusion of Iliad in French (3)
I believe the answer is:
den
'study' is the definition.
(I've seen this before)
'conclusion of iliad in french' is the wordplay.
'conclusion of' says to take the final letters.
'in french' becomes 'en' ('en' can be French for 'in' e.g. en France).
The final letter of 'iliad' is 'd'.
'd'+'en'='DEN'
(Other definitions for den that I've seen before include "Hidden lair of an animal" , "Room for work or play" , "Animal's home or gent's study" , "Home of the beast" , "Lair for animal or study for gent" .)