Relations camp without protection in America (5,3)
I believe the answer is:
uncle sam
'america' is the definition.
(I've seen this before)
'relations camp without protection' is the wordplay.
'relations' becomes 'uncles' (uncle is a kind of relation**).
'without protection' means to look at the middle letters (no outside letters).
The centre of 'camp' is 'am'.
'uncles'+'am'='UNCLE SAM'
'in' acts as a link.
(Other definitions for uncle sam that I've seen before include "America as a recruiting officer" , "US government personification" , "Personification of USA" , "Embodiment of the USA" , "America personified" .)