Present her with a key (4)
I believe the answer is:
here
'present' is the definition.
(both can mean in attendance)
'her with a key' is the wordplay.
'with' says to put letters next to each other.
'a key' becomes 'e' (a musical key).
'her'+'e'='HERE'
(Other definitions for here that I've seen before include "Present; I say!" , "Hither" , ""___ be dragons" (old map inscription?)" , "At this stage" , "final clue?" .)