Issue securing pile, able to click into place (4-2)
I believe the answer is:
snap-on
'able to click into place' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'issue securing pile' is the wordplay.
'issue' becomes 'son' (issue can mean someone's offspring).
'securing' means one lot of letters goes inside another.
'pile' becomes 'nap' (both can refer to the surface of a fabric).
'son' enclosing 'nap' is 'SNAP-ON'.
Can you help me to learn more?
(Another definition for snap-on that I've seen is " Describing a tool, device, or part that doesn't require a screwed attachment".)