Annotation abbreviation (4)
I believe the answer is:
ibid
'annotation abbreviation' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ibid that I've seen before include "(When citing a reference) in the same place (abbr)" , "In the same place (L)" , "'In the same place as previously mentioned, in short (4)'" , "(With written references) in the same place (Latin)" , "(When citing a reference) in the same place (Latin)" .)