First nogs are in line and secure (4)
I believe the answer is:
nail
'secure' is the definition.
(both can mean to apprehend or capture)
'first nogs are in line' is the wordplay.
'first' says to take the initial letters.
The initial letters of 'nogs are in line' is 'NAIL'.
'and' is the link.
(Other definitions for nail that I've seen before include "Part of finger" , "Fixing spike" , "Small metal spike" , "Finger feature (and tooth?)" , "Hard plate at end of digit" .)