Repeat aloud from memory (6)
I believe the answer is:
recite
'repeat aloud from memory' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for recite that I've seen before include "Repeat, recount" , "Speak lines from a poem or passage from book" , "Reel off" , "Speak (eg, a poem)" , "Give detailed account" .)