Hapless duo sit in workshop (6)
I believe the answer is:
studio
'workshop' is the definition.
(I know that workshop can be written as studio)
'hapless duo sit' is the wordplay.
'hapless' indicates an anagram.
'duo'+'sit'='duosit'
'duosit' with letters rearranged gives 'STUDIO'.
'in' acts as a link.
(Other definitions for studio that I've seen before include "Workroom for 27 down" , "In which to make a film or programme" , "Film company - artist's atelier" , "Here one may record" , "Centre for movie-making" .)