### Clue: Many families wary about wobbly pub chimney (9)
### Answer: SUBPHYLUM 
 ### Explanation: Definition: Many families
 [SHY(to be wary of, eg. a child in front of strangers) **containing**(about) **anagram of**(wobbly) PUB] + LUM(a chimney).
Answer: In biology, life forms are ordered by the following classifications: Domain, Kingdom, Phylum, Class, Order, Family, Genus and lastly Species. In linguistics, a phylum is a category of related languages. In both cases, the subphylum consists of many families.