Clue: Failed to notice deliveries made by butcher's boy (10)
Answer: OVERLOOKED
Explanation: Failed to notice deliveries made by butcher's boy (10)

**OVER** ("deliveries made" in cricket) *by* **LOOK** ("butcher's") + **ED** (short for Edward, so "boy")
 

 
*Butcher's is short for "butcher's hook", rhyming slang for "look"