Crossword Genius

Prison and one who should be in it? (7)

Ross

I believe the answer is:

brigand

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'one who should be in it?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'prison and' is the wordplay.
'prison' becomes 'brig' (I've seen this before).
'brig'+'and'='BRIGAND'

Can you help me to learn more?

(Other definitions for brigand that I've seen before include "Bandit" , "Outlaw" , "Marauder" , "Plunderer" , "Criminal" .)

I've seen this clue in The Sun.
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