Crossword Genius

Characters inspired by Benjamin Franklin later on (5)

Ross

I believe the answer is:

infra

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'later on' is the definition.
Both the definition and answer are adverbs. Maybe there's an association between them I don't understand?

'characters inspired by benjamin franklin' is the wordplay.
'INFRA' is hidden within the letters.
However, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for infra that I've seen before include "-- Dig means degrading" , "Latin adverb meaning below or further on in book" , "Below (as prefix)" , "appearing later in book?" , "Coming below" .)

I've seen this clue in The Guardian.
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