Clue: One quietly avoids ice-cream in lounge (6)
Answer: LOLLOP
Explanation: Definition: lounge
**LOLL**(ip)**OP** ("ice-cream") with I ("one") and P(iano) ("quietly") *avoided* 
Wasn't sure about this, but at least one online dictionary has "lollipop" meaning "ice cream", although I have always used "ice lolly", with lollipop being a hard (or sometimes chewy) sweet on a stick.