Look back again (4)
I believe the answer is:
peep
This might be a double definition.
'look' is the first definition.
(peep is a kind of look)
'back again' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for peep that I've seen before include "Chirp" , "Peek" , "Large underground chamber" , "Sly look (palindrome)" , "Look quickly" .)