Person who stays up late near to window ledge, initially (5,3)
I believe the answer is:
night owl
'person who stays up late' is the definition.
'night owl' can be an answer for 'person' (night owl is a kind of person). I am unsure of the rest of the definition.
'near to window ledge initially' is the wordplay.
'near' becomes 'nigh' (synonyms).
'initially' indicates taking the first letters.
The initial letters of 'window ledge' is 'wl'.
'nigh'+'to'+'wl'='NIGHT-OWL'
Can you help me to learn more?
(Other definitions for night owl that I've seen before include "Person who likes to be active late into the evening" , "One who puts off retirement" , "One working late" , "One active after dark" , "Person active in the small hours" .)