Possible Clues:

• Above on a church, stretch too far on a ladder?
• Do too much at a stretch?
• Possible strain cause
• Go too far, making deliveries by part of river?
• Concerning resistance to a head, try to be too clever
• Try too hard
• Do too much to hear cover version
• Venture too far having completed stretch of river
• Runs after cricket balls, each having to stretch too far
• Caver hero (anag)