Actress changing gear with Bogart (5,5)
I believe the answer is:
greta garbo
'actress' is the definition.
(I've seen this before)
'changing gear with bogart' is the wordplay.
'changing' indicates anagramming the letters.
'with' says to put letters next to each other.
'gear' after 'bogart' is 'bogartgear'.
'bogartgear' is an anagram of 'GRETA GARBO'.
(Other definitions for greta garbo that I've seen before include "See actress" , "Old actress" .)