Possible Clues:

• Take over from senior policemen on short Cornish project
• Take over from
• Replace cool food for one going 14, say
• Take the place of, supplant
• Discard policeman with sound descendants ...
• Replace what sounds like great garden-centre product
• Replace police officer — and auditor's to give up
• Take the place of, move into the position of
• Replace leather worn by individual: not on!
• Replace Jack's potential beanstalk, as related?