Girl wearing long mac unsettled poor poet (10)
I believe the answer is:
mcgonagall
'poor poet' is the definition.
(I've seen this before)
'girl wearing long mac unsettled' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'ag' and 'ag' is found within the answer.
'long' could be 'l' and 'l' is present 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 mcgonagall that I've seen before include "poor poet" , "William --, poet (The Tay Bridge Disaster)" , "Scottish poet, considered one of the worst ever, d. 1902" , "Scots poet" .)