Hostel laments accepting obsolete experimental coin (6)
I believe the answer is:
stella
'obsolete experimental coin' is the definition.
(historical type of US coin)
'hostel laments accepting' is the wordplay.
'accepting' indicates a hidden word (the answer has been accepted by the clue).
'STELLA' can be found hidden inside 'hostel laments'.
(Other definitions for stella that I've seen before include "girl!" , "- Gibbons (Cold Comfort Farm)" , "Girl's name meaning star" , "Swift alias for Esther" , "Paul McCartney's daughter" .)