Crossword Genius

Manage one top conundrum having a mysterious meaning (5)

Ross

I believe the answer is:

runic

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

'a mysterious meaning' is the definition.
Although both the answer and definition are adjectives, I can't see how they can define each other.

'manage one top conundrum' is the wordplay.
'manage' becomes 'run' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'top' suggests taking the first letters.
The first letter of 'conundrum' is 'c'.
'run'+'i'+'c'='RUNIC'

'having' acts as a link.

Can you help me to learn more?

(Other definitions for runic that I've seen before include "Like some old characters" , "Using Norse letters" , "character hard to interpret" , "Of old magic symbols" , "Inscribed with ancient symbols" .)

I've seen this clue in The Sydney Morning Herald.
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