A camp or billet being arranged? It's questionable (13)
I believe the answer is:
problematical
'questionable' is the definition.
(similar in meaning)
'a camp or billet being arranged?' is the wordplay.
'being arranged?' indicates an anagram (letters rearranged).
'a'+'camp'+'or'+'billet'='acamporbillet'
'acamporbillet' anagrammed gives 'PROBLEMATICAL'.
'it's' acts as a link.
(Other definitions for problematical that I've seen before include "Open to doubt or debate" , "Difficult; doubtful" , "Presenting difficulties" , "Dubious" .)