Relating to punishment (5)

I believe the answer is:

penal

'relating to punishment' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for penal that I've seen before include "Deliberately unpleasant" , "Involving legal punishment" , "Involving punishment as by the law" , "Relating to legal punishment" , "Punishing" .)

I've seen this clue in The Times and The Irish Times.

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