Art exhibit everybody enters in Euston? (12)

I believe the answer is:

installation

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'art exhibit' is the definition.
(I've seen this before)

'everybody enters in euston?' is the wordplay.
'everybody' becomes 'all' (all people).
'enters' means one lot of letters goes inside another.
'euston?' becomes 'station' (I can't justify this - if you can you should believe this answer much more).
'in'+'station'='instation'
'all' inserted into 'instation' is 'INSTALLATION'.

Can you help me to learn more?

(Other definitions for installation that I've seen before include "Large gallery artwork" , "A setting up; equipment so set" , "establishment" , "Positioning" , "The making of equipment ready for use" .)

I've seen this clue in The Times.

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