Caret indication (6)
I believe the answer is:
insert
'caret indication' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for insert that I've seen before include "One might be seen" , "Introduce, put in" , "place in the interior" , "Place (something) inside (something else)" , "Put between or within other things" .)