Possible Clues:

• Crosaire isn't yet so to see about nothing
• 'Not, we hope, for Crosaire to take a sound look at the old river (6)'
• Declining in old age
• Mentally infirm with age
• Having an old-age problem
• Softheaded
• Most of the view on river is declining as the years go by
• Affected by old age
• Old and doddery
• Out of it due to age