Skyline features
I believe the answer is:
spires
'skyline features' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spires that I've seen before include "Tall towers that tapers to a point" , "Oxford has many" , "Tall towers tapering to a point" , "'And that sweet city with her dreaming ------' (M Arnold)" , "On 11 down, they taper to a point" .)