Good faith in sofa bed misplaced (4,5)
I believe the answer is:
bona fides
'good faith' is the definition.
(I've seen this before)
'in sofa bed misplaced' is the wordplay.
'misplaced' indicates an anagram (letters in the wrong places).
'in'+'sofa'+'bed'='insofabed'
'insofabed' anagrammed gives 'BONA FIDES'.
(Other definitions for bona fides that I've seen before include "Honesty and sincerity of intention" , "In good faith (Latin)" .)