Clue: Angry about fashionable clothes shop wanting support for arms cocktail (9,5)
Answer: SINGAPORE SLING
Explanation: Definition: cocktail 

**SORE** ("angry") *about* **IN** ("fashionable") + **GAP** ("clothes shop") *wanting* **SLING**
 
*GAP is no longer a "clothes shop" in the UK as it went online instead, although I believe there are some concessions in Next shops.