### Clue: Twelve syllables and rhymes in verse of old times (11)
### Answer: ALEXANDRINE 
 ### Explanation: Definition: verse of old times
 Early/old times form of French poetry/verse, consisting of a line of 12 syllables with a pause between the 6th and 7th syllables. The wordplay seems to be the clue itself: Twelve syllables and rhymes // in verse of old times. But that line is 6+5 and not 6+6 syllables – unless I've counted wrongly?