Unduly protracted line about disease consuming Haggard (4-5-3)
I believe the answer is:
long-drawn-out
'unduly protracted' is the definition.
(I've seen this before)
'line about disease consuming haggard' is the wordplay.
I cannot really understand how this works, but
'line' could be 'draw' (synonyms) and 'draw' is found in the answer.
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for long-drawn-out that I've seen before include "Unduly protracted" , "Unduly extended" .)