Not Ann. You! (4)
I believe the answer is:
thee
'you' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for thee that I've seen before include "Quaker 'you'" , "Poetically you" , "You (arch.)" , "you many years ago" , "Archaic form of 'you'" .)