They kill two animals at home with tip of sword (9)

I believe the answer is:

assassins

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'they kill' is the definition.
Although both the answer and 'kill' are nouns, they are not in the same form of the noun.

'two animals at home with tip of sword' is the wordplay.
'two animals' can mean two replacements for 'animal'.
'animal' becomes 'ass' (term for a donkey).
'animal' becomes 'ass' (term for a donkey).
'at home' becomes 'in' (similar in meaning).
'with' means one lot of letters go next to another.
'tip of' suggests taking the first letters.
The first letter of 'sword' is 's'.
'ass'+'ass'+'in'+'s'='ASSASSINS'

Can you help me to learn more?

(Other definitions for assassins that I've seen before include "Hit men" , "Offers" , "Paid killers" .)

I've seen this clue in The Hindu.

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