Massive craze about Gussalufz round America (10)

I believe the answer is:

tremendous

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'massive' is the definition.
(thesaurus)

'craze about gussalufz round america' is the wordplay.
'craze' becomes 'trend' (I've seen this in another clue).
'about' indicates putting letters inside.
'gussalufz' becomes 'me' (where the crossword setter is 'Gussalufz').
'round america' becomes 'ous' (I can't justify this - if you can you should believe this answer much more).
'trend' going around 'me' is 'tremend'.
'tremend'+'ous'='TREMENDOUS'

Can you help me to learn more?

(Other definitions for tremendous that I've seen before include "Immense" , "Excellent; very great" , "Fantastic" , "Wonderful" , "Splendid!" .)

I've seen this clue in The Hindu.

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