Lavish amount put out round America (9)
I believe the answer is:
sumptuous
'lavish' is the definition.
(I've seen this in another clue)
'amount put out round america' is the wordplay.
'amount' becomes 'sum' (synonyms).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'round america' becomes 'ous' (I can't justify this - if you can you should believe this answer much more).
'put' with letters rearranged gives 'ptu'.
'sum'+'ptu'+'ous'='SUMPTUOUS'
Can you help me to learn more?
(Other definitions for sumptuous that I've seen before include "Splendid, rich" , "Delicious and expensive" , "Extravagant" , "Grand" , "Magnificent" .)