Look back repeatedly (4)
I believe the answer is:
peep
This clue could be a double definition.
'look' is the first definition.
(peep is a kind of look)
'back repeatedly' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for peep that I've seen before include "Furtive look" , "Spy" , "Look furtively or voyeuristically" , "Look furtively (in both directions)" , "Look furtively (either way)" .)