Crossword Genius

Jack has trouble in prison (4)

Ross

I believe the answer is:

jail

'prison' is the definition.
(jail can mean a prison)

'jack has trouble' is the wordplay.
'jack' becomes 'J' (playing card abbreviation).
'has' means one lot of letters go next to another.
'trouble' becomes 'ail' (synonyms).
'j'+'ail'='JAIL'

'in' is the link.

(Other definitions for jail that I've seen before include "sentence" , "Correctional institution" , "Gaol" , "Cooler" , "place for punishment" .)

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