No gruel is ordered for an idler (7)
I believe the answer is:
lounger
'an idler' is the definition.
(lounger is a kind of idler)
'no gruel is ordered' is the wordplay.
'is ordered' indicates anagramming the letters.
'no'+'gruel'='nogruel'
'nogruel' with letters rearranged gives 'LOUNGER'.
'for' is the link.
(Other definitions for lounger that I've seen before include "Relax on this" , "Reclining chair" , "Sunbed" , "Casual coat" , "Comfortable couch" .)