Woman I see hiding gun (6)
I believe the answer is:
agatha
'woman' is the definition.
(woman's name)
'i see hiding gun' is the wordplay.
'i see' becomes 'aha' (both are said after realising something).
'hiding' indicates putting letters inside.
'gun' becomes 'gat' (gat is a kind of gun).
'aha' placed around 'gat' is 'AGATHA'.
(Other definitions for agatha that I've seen before include "...... Christie wrote great detective stories" , "Wodehouse aunt" , "Writer who created Hercule Poirot, . . . . . . Christie" , "...... Christie, author" , "-- Christie, English novelist" .)