Strangely, nude art not valued (7)
I believe the answer is:
unrated
'not valued' is the definition.
'strangely nude art' is the wordplay.
'strangely' indicates anagramming the letters.
'nude'+'art'='nudeart'
'nudeart' is an anagram of 'UNRATED'.
(Other definitions for unrated that I've seen before include "without standing?" , "given no status" , "Not assigned a value" , "Not assessed" , "not censured" .)