Comfortable, attentively awaiting execution (4-2-2)
I believe the answer is:
well-to-do
'comfortable' is the definition.
(I've seen this before)
'attentively awaiting execution' is the wordplay.
'attentively' becomes 'well' (to listen well is to listen attentively).
'awaiting execution' becomes 'to do' (still to be done or executed).
'well'+'todo'='WELL-TO-DO'
(Other definitions for well-to-do that I've seen before include "Rich; old towel (anag.)" , "Quite wealthy" , "Affluent" , "Financially comfortable" , "Fairly rich, prosperous" .)