Clue: Shakespearean pouch over middle of costume (6)
Answer: POAKET
Explanation: Definition: Shakespearean pouch over middle of costume
**POAKE** ("Shakespearean" word for "pouch") *over* [*middle of*] (cos)**T**(Ume) 
**PET ***(potentially exempt transfer – "present") about ***OAK*** ("tree")