Clue: Boy digs into brownies and plum, being offered nothing else (7,6)
Answer: HOBSON’S CHOICE
Explanation: Boy digs into brownies and plum, being offered nothing else (7,6)
**SON** ("boy") *digs into* **HOBS** ("brownies") + **CHOICE** ("plum") 
*A hob is a sprite or elf, as is a brownie.