Understand only odd bits of scene (3)
I believe the answer is:
see
'understand' is the definition.
('see' can be a synonym of 'understand')
'only odd bits of scene' is the wordplay.
'only odd bits of' means one should take alternating letters.
The alternating letters of 'scene' are 'SEE'.
(Other definitions for see that I've seen before include "date" , "Consider; diocese" , "Go out with; notice" , "Set eyes on" , "twig" .)