Unwise to be out? (9)
I believe the answer is:
senseless
I believe this clue is a double definition.
'unwise' is the first definition.
(thesaurus)
'be out?' is the second definition.
(thesaurus)
'to' acts as a link.
(Other definitions for senseless that I've seen before include "Futile" , "Mindless, pointless" , "Wildly foolish" , "unable to hear, perhaps?" , "Illogical; stupid" .)