Possible Clues:

• Hang on to ... or a word that can precede either half of the answer to each starred clue
• Strongest part of a castle
• Look up 'Subsistence'
• Observe, when you look up
• Don't give a look-up to the castle
• Stock needing a quick look over
• ____ time
• Take a look up at the castle
• Act as custodian of central tower
• The return, see you don't lose