Loss of memory (7)
I believe the answer is:
amnesia
'loss of memory' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for amnesia that I've seen before include "Asia men with memory loss (7)" , "Pathological forgetfulness" , "Seaman I found in state of memory loss" , "As a mine (anag)" , "memory problem" .)