Crossword Genius

Genuine manuscript showing spheres of activity (6)

Ross

I believe the answer is:

realms

I'm a little stuck... Click here to teach me more about this clue!

'spheres of activity' is the definition.
'realms' can be an answer for 'spheres' ('realm' can be a synonym of 'sphere'). I'm not sure about the 'of activity' bit.

'genuine manuscript' is the wordplay.
'genuine' becomes 'real' (similar in meaning).
'manuscript' becomes 'ms' (abbreviation for manuscript).
'real'+'ms'='REALMS'

'showing' is the link.

Can you help me to learn more?

(Other definitions for realms that I've seen before include "Kingdoms, or fields of activity" , "Kingdoms, or fields of interest" , "Domains ruled by king or queen" , "Domains - provinces" , "Kingdoms, domains" .)

I've seen this clue in The Guardian.
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