What Prodigal Son shows additionally (4)

I believe the answer is:

also

'additionally' is the definition.
(thesaurus)

'what prodigal son shows' is the wordplay.
'shows' says the answer is hidden in the clue.
'ALSO' can be found hidden inside 'what prodigal son'.

(Other definitions for also that I've seen before include "on top" , "Furthermore" , "Likewise" , "'Besides, moreover (4)'" , "Additionally" .)

I've seen this clue in The Times.

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