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Alteration in the pub gets a warm welcome (10)

Ross

I believe the answer is:

innovation

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'alteration' is the definition.
(thesaurus)

'pub gets a warm welcome' is the wordplay.
'pub' becomes 'inn' (an inn is a type of pub).
'gets' means one lot of letters go next to another.
'a warm welcome' becomes 'ovation' (I can't justify this - if you can you should give a lot more credence to this answer).
'inn'+'ovation'='INNOVATION'

'in the' is the link.

Can you help me to learn more?

(Other definitions for innovation that I've seen before include "original" , "What's new" , "New idea" , "Something new" , "Something introduced as a novelty" .)

I've seen this clue in The Globe and Mail.
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