Sort of angle without apex (3)
I believe the answer is:
ish
'sort of' is the definition.
(eg newish means sort of new)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ish that I've seen before include "Suffix meaning like or characteristic of" , "loosely" , "Expiry (in Scots law)" .)