### Clue: Head of languages getting extremely upset during squabble with servile flatterer (10)
### Answer: BOOTLICKER 
 ### Explanation: Definition: servile flatterer
 [**1st letter of**(Head of) "languages" **placed below**(getting, in a down clue) **reversal of**(… upset) TOO(extremely/very)] **contained in**(during) BICKER(to squabble/to argue about petty and trivial matters).