Old story in Swahili adapted (5)
I believe the answer is:
iliad
'old story' is the definition.
(I've seen this before)
'in swahili adapted' is the wordplay.
'in' says the answer is hidden in the clue.
'ILIAD' can be found hidden inside 'swahili adapted'.
(Other definitions for iliad that I've seen before include "Homer Trojan war epic" , "tale of woes" , "Epic piece of writing" , "Homer's great poem" , "heroic work" .)