Loss of memory (7)
I believe the answer is:
amnesia
'loss of memory' is the definition.
(I've seen this before)
This is the entire 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" .)