Take the first 3 letters and you can find this on your keyboard
Take the first 5 letters and it means to change something
Take the last 6 letters and it is still a word
What is the word?
Extra Hint :
It is an adjective
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I think the answer is
alt is a key on the keyboard
alter means to change
last 6 letters make the word 'native'
And alternative is an adjective