### Clue: Silver-tongued Liberal unknown speaks in a spell-binding way (10)
### Answer: ELOQUENTLY 
 ### Explanation: Definition: speaks in a spell-binding way
 ELOQUENT(silver-tongued;speaking persuasively) + L(abbrev. for a Liberal politician) + Y(one of the symbols in mathematics for an unknown variable). A not very satisfying kind of clue – where a (major) part of the wordplay is essentially the root word for the definition.