Sort of pin you find in numbers? (6)
I believe the answer is:
safety
I believe this clue is a double definition.
'sort of pin' is the first definition.
'you find in numbers?' is the second definition.
(reference to the phrase 'safety in numbers')
(Other definitions for safety that I've seen before include "immunity" , "Welfare" , "Freedom from danger or harm" , "Security; sanctuary" , "The condition of being protected from danger" .)