A number with point (3)
I believe the answer is:
pin
I believe this clue is a double definition.
'a number' is the first definition.
(I've seen this before)
'point' is the second definition.
(thesaurus)
'with' acts as a link.
(Other definitions for pin that I've seen before include "Needle" , "Cashpoint code" , "Sewer's aid" , "Number allocated for electronic transactions" , "Initially, confidential number for use of bank card" .)