Trendy program on old computer location not appropriate (10)

I believe the answer is:

inapposite

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'appropriate' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'trendy program on old computer location not' is the wordplay.
'trendy' becomes 'in' ('in' can mean fashionable).
'program' becomes 'app' (type of computer program).
'on' says to put letters next to each other.
'old computer location' becomes 'site' (I can't explain this - if you can you should believe this answer much more).
'not' becomes 'o' (I've seen this in other clues).
'site' after 'o' is 'osite'.
'in'+'app'+'osite'='INAPPOSITE'

Can you help me to learn more?

(Another definition for inapposite that I've seen is " Out of place".)

I've seen this clue in The Guardian.

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