Odd claptrap backfired on border quickly (2,1,4)

'quickly' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'odd claptrap backfired on border' is the wordplay.
'odd' means one should take alternating letters.
'backfired' says the letters should be written backwards.
'on' means one lot of letters go next to another.
'border' becomes 'lip' (I've seen this in other clues).
The alternate letters of 'claptrap' are 'cata'.
'cata' in reverse letter order is 'atac'.
'atac'+'lip'='AT A CLIP'

Can you help me to learn more?