Trying to get behind? (5)
I believe the answer is:
after
'behind?' is the definition.
(I've seen this in other clues)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for after that I've seen before include "Subsequently" , "Following - behind" , "Searching for" , "In pursuit of, behind" , "Behind; in quest of" .)