Thing indicated in past history (4)
I believe the answer is:
this
'thing indicated' is the definition.
I can't tell whether this defines the answer.
'in past history' is the wordplay.
'in' indicates the answer is hidden within the clue.
'THIS' is hidden within 'past history'.
Can you help me to learn more?
(Other definitions for this that I've seen before include "The thing just mentioned" , "The thing here referred to" , "Hits (anag.)" , "Pronoun to point out nearby things" , "One particular" .)