Like some angles (5)
I believe the answer is:
acute
'like some angles' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acute that I've seen before include "Discerning" , "(Of an angle) less than 90 degrees" , "Piercing" , "quick on the uptake" , "Severe, penetrating" .)