advanced amateur; high-level amateur
Wasei-eigo term often used in photography, music, or other skilled hobbies to describe a very proficient non-professional.
wasei-eigo (Japanese-coined English), from high amateur
He held an exhibition as an advanced amateur photographer.
A high-level amateur pianist won a prize at the competition.
Variant with interpunct; less common but still seen.
Wasei-eigo from English 'high' + 'amateur'. The exact origin is uncertain, but it likely emerged in hobbyist circles to distinguish highly skilled amateurs.