### Clue: Worker's joints are wonderful (4,5)
### Answer: BEES KNEES 
 ### Explanation: Definition: wonderful
  BEE'S(worker's) KNEES(joints). 
Answer: Describing person or thing that's wonderful.  Akin to the cat's pyjamas or whiskers, or the kipper's knickers  or the dog's (the second anatomical part of the phrase which rhymes with dogs, is implicit).