Possible Clues:

• Amaze a son with this developing
• Cause amazement with regard to backing wrong hotel
• Surprise when mate withholds national insurance
• Confound his manoeuvring, holding up half the team
• 'If one sat on his, that would shake him (8)'
• Amaze, surprise
• Surprise: IOS hasn't worked
• Stagger in with sot, reeling into tree
• Surprise greatly, like rubbish written about the Province
• What a maze may do to you