A gloomy, dismal expression produced by Yank with brother on notice to pay debt in America (10)
I believe the answer is:
lugubrious
'a gloomy' is the definition.
(thesaurus)
'dismal expression produced by yank with brother on notice to pay debt in america' is the wordplay.
I cannot really see how this works, but
'brother' could be 'br' and 'br' is found within the answer.
'debt' could be 'iou' and 'iou' is found in the answer.
'america' could be 'us' (abbreviation for the United States) and 'us' is located in the answer.
The remaining letters 'lug' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lugubrious that I've seen before include "Dismal" , "Sad, mournful" .)