It can be deciphered on poster by expert (8)

I believe the answer is:

readable

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'it can be deciphered' is the definition.
The definition suggests a singular noun but the answer is not.

'on poster by expert' is the wordplay.
'on' becomes 're' (regarding).
'poster' becomes 'ad' (short for advert).
'by' is a charade indicator (letters next to each other).
'expert' becomes 'able' (able can mean expert or talented).
're'+'ad'+'able'='READABLE'

Can you help me to learn more?

(Other definitions for readable that I've seen before include "Legible" , "Like good book" , "okay as literature" , "Descriptive of an interesting book or good handwriting" , "can be studied" .)

I've seen this clue in The Irish Times.

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