Possible Clues:

• Near version of composer
• British composer of ''Alfred''
• 'Rule Britannia' composer Thomas
• В“Rule, Britannia" composer Thomas
• Thomas -, Rule Britannia composer
• Contralto Susannah Maria __ who debuted in her brother Thomas's first opera
• Rule, Britannia author
• Composer arranged in oddly selective way
• English anthemist
• Composer of Rule Britannia