For safety, their points may be covered (4)
I believe the answer is:
pins
'for safety their' is the definition.
I can't judge whether this defines the answer.
'points may be covered' is the wordplay.
I cannot quite see how this works, but
'points' could be 'ns' (N is an example) and 'ns' is located in the answer.
The remaining letters 'pi' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pins that I've seen before include "Wire fasteners" , "security codes" , "Stocking fillers" , "With needles, they create a tingling sensation" .)