Possible Clues:

• Period from cause to effect
• ... stretch done by prisoner must intervene
• The second part has to serve the first, hence delay
• Girl let out, returning in the interval
• Some delay in imposing sentence on convict
• Delay sentence to be given to prisoner
• Period between two connected events
• Sentence convict, despite delay
• Interval when prison sentence is served on recidivist
• Chap gets the wind up in the interval