Possible Clues:

• Tender after too much walking
• Long-standing, quite possibly
• Tired of walking in 5 across out to bag ducks
• Tired of walking round and round in '1 down', lost
• Feeling effect of too much walking - put on slippers
• Suffering from much walking
• Dog-tired from hiking, e.g.
• Needing to sit
• Having tender tootsies
• In need of Dr. Scholl's products