Body in the boot (5)
I believe the answer is:
trunk
I believe this clue is a double definition.
'body' is the first definition.
(synonyms)
'boot' is the second definition.
(synonyms)
'in the' is the link.
(Other definitions for trunk that I've seen before include "Part of a tree - part of an elephant" , "Proboscis" , "Torso - box" , "main part of plane" , "boot of Cadillac?" .)