He wrote, maybe on card (6)

I believe the answer is:

conrad

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'he wrote' is the definition.
The definition suggests a singular noun which matches the answer.

'maybe on card' is the wordplay.
'maybe' indicates anagramming the letters.
'on'+'card'='oncard'
'oncard' is an anagram of 'CONRAD'.

Can you help me to learn more?

(Other definitions for conrad that I've seen before include "Joseph --, writer (Lord Jim)" , "Joseph --, author" , "Heart of Darkness author" , "Author of Lord Jim" , "Joseph -, novelist (Heart of Darkness)" .)

I've seen this clue in the Evening Standard.

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