Clue: Natter about vacuous froth, wee time wasted! (4,3,3)
Answer: CHEW THE FAT
Explanation: Definition: Natter
An envelope ('about') of EWTHEF, an anagram ('wasted') of FH ('vacuous **F**rot**H**') plus 'wee' plus T ('time') in CHAT ('natter'), with an &lit definition.