Everybody after this month to invest in an office (7)

I believe the answer is:

install

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'invest in an office' is the definition.
'install' can be an answer for 'invest' (I've seen this before). I'm unsure of the 'in an office' bit.

'everybody after this month' is the wordplay.
'everybody' becomes 'all' (all people).
'after' says to put letters next to each other.
'this month' becomes 'inst' (letter-writing abbreviation for this month).
'all' put after 'inst' is 'INSTALL'.

'to' is the link.

Can you help me to learn more?

(Other definitions for install that I've seen before include "Fix (equipment) in position" , "Fix in position ready for use" , "Station" , "Put in - invest" , "Set in place" .)

I've seen this clue in The Irish News.

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