Dancing nude foxtrot, finished up exposed (10)
I believe the answer is:
undefended
'exposed' is the definition.
(lacking defence or protection)
'dancing nude foxtrot finished up' is the wordplay.
'dancing' indicates an anagram.
'foxtrot' becomes 'f' (phonetic alphabet: alpha, bravo, charlie etc.).
'finished up' becomes 'ended' (to finish up is to end or complete something).
'nude' anagrammed gives 'unde'.
'unde'+'f'+'ended'='UNDEFENDED'
(Other definitions for undefended that I've seen before include "without protection" , "Not protected from harm" .)