Sneakily look up and down? (4)
I believe the answer is:
peep
This clue might be a double definition.
'sneakily look' is the first definition.
'peep' can be an answer for 'look' (peep can mean to look at something). I am not certain of the 'sneakily' bit.
'up and down?' is the second definition.
Can you help me to learn more?
(Other definitions for peep that I've seen before include "Look surreptitiously, like Tom" , "Palindromic glimpse" , "Peek" , "Look secretly" , "Look furtively or voyeuristically" .)