Could then, abroad, in the altogether (9)
I believe the answer is:
unclothed
'in the altogether' is the definition.
('unclothed' can be similar in meaning to 'in the altogether')
'could then abroad' is the wordplay.
'abroad' indicates an anagram.
'could'+'then'='couldthen'
'couldthen' with letters rearranged gives 'UNCLOTHED'.
(Other definitions for unclothed that I've seen before include "Not dressed" , "Couldn't he try to be naked?" .)