Description of Tudor monarch's interval of twelve semitones (6)
I believe the answer is:
octave
This could be a double definition.
'description of tudor monarch's interval' is the first definition.
'octave' can be an answer for 'interval' (octave is a kind of interval). I am unsure of the 'description of tudor monarch's' bit.
'twelve semitones' is the second definition.
(I've seen this before)
'of' acts as a link.
Can you help me to learn more?
(Other definitions for octave that I've seen before include "Musical term - set of eight" , "Interval of 12 semitones" , "Series of eight consecutive musical notes" , "between two pitches" , "A verse of eight lines" .)