Body – difficult (5)
I believe the answer is:
stiff
This clue is a double definition.
'body' is the first definition.
(I know that stiff is a type of body)
'difficult' is the second definition.
(I've seen this before)
(Other definitions for stiff that I've seen before include "Severe - conventional - dead body" , "tough" , "Unfriendly" , "Not giving" , "Inflexible" .)