Unchanged pitch is minute and impossible, given Yorkshire's tail (8)
I believe the answer is:
monotone
'unchanged pitch' is the definition.
'monotone' can be an answer for 'pitch' (thesaurus). I am not certain of the 'unchanged' bit.
'minute and impossible given yorkshire's tail' is the wordplay.
'minute' becomes 'mo' (both can mean a short amount of time).
'and' says to put letters next to each other.
'impossible' becomes 'noton' (I've seen this before).
'given' is a charade indicator (letters next to each other).
'tail' says to take the final letters.
The last letter of 'yorkshire' is 'e'.
'mo'+'noton'+'e'='MONOTONE'
'is' is the link.
Can you help me to learn more?
(Other definitions for monotone that I've seen before include "Sound of unchanging pitch" , "Utterance at a single unvaried level" , "Single unvaried sound level" , "Single unvarying note" , "Flat and unchanging in pitch" .)