Party welcoming a break (4)

I believe the answer is:

snap

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'break' is the definition.
(I know that snap is a type of break)

'party welcoming a' is the wordplay.
'party' becomes 'snp' (I can't explain this - if you can you should believe this answer much more).
'welcoming' is an insertion indicator (in sense of 'inviting in').
'snp' placed around 'a' is 'SNAP'.

Can you help me to learn more?

(Other definitions for snap that I've seen before include "Crack; bite" , "Become unhinged" , "Break sharply like dry twig" , "Break like simple card game" , "Break like informal photo" .)

I've seen this clue in The Guardian.

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