Possible Clues:

• Soldiers' wakening call
• Soldiers with blanket, asleep, essentially woken by this?
• Military call always recalled unwell European
• What people privately get up to is a wake-up call for those working for a major employer
• Morning call
• Wake-up call concerning girl unwell inside
• About to ring apple-picker with incorrect wake-up call
• Bugle at daybreak
• Military bugle call at sunrise
• With regard to cover the French must get a wake-up call