### Clue: Odd bits of pea mousse polished off? They'll never take off (4)
### Answer: EMUS 
 ### Explanation: Definition: They'll never take off
[*odd bits of*] (p)**E**(a)**M**(o)**U**(s)**S**(e) *polished off*, leaving the even letters to spell out EMUS (birds that will "never take off")