Characters in Beau Geste emphasising respect (6)
I believe the answer is:
'respect' is the definition.
(I know that respect can be written as esteem)
'characters in beau geste emphasising' is the wordplay.
'characters in' indicates a hidden word.
'ESTEEM' is hidden within 'beau geste emphasising'.
(Other definitions for esteem that I've seen before include "Venerate" , "'Regard, respect (6)'" , "Hold in deference and respect" , "judge" , "Favourable regard" .)