Voyager’s headless corpse son takes legal action over (8)
I believe the answer is:
odysseus
'voyager's' is the definition.
(I've seen this before)
'headless corpse son takes legal action over' is the wordplay.
'headless' means to remove the first letter.
'corpse' becomes 'body' (I've seen this before).
'son' becomes 's' (genealogical abbreviation for son).
'takes legal action' becomes 'sues' (to sue is to take legal action against someone).
'over' says the letters should be written backwards.
'sues' written backwards gives 'seus'.
'body' with its initial letter taken away is 'ody'.
'ody'+'s'+'seus'='ODYSSEUS'
(Other definitions for odysseus that I've seen before include "Hero of an epic poem attributed to Homer" , "Homer's mythical Greek hero" , "King of Ithaca, who returned after the siege of Troy" , "Classical traveller" , "Legendary Greek king" .)