Was including the theatre in one's needs (5)

I believe the answer is:

wants

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'one's needs' is the definition.
'wants' can be an answer for 'needs' (want is a kind of need). I am not sure about the 'one's' bit.

'was including the theatre' is the wordplay.
'including' means one lot of letters goes inside another.
'the theatre' becomes 'NT' (National Theatre).
'was' going around 'nt' is 'WANTS'.

'in' is the link.

Can you help me to learn more?

(Other definitions for wants that I've seen before include "Desires" , "Needs" .)

I've seen this clue in the Evening Standard.

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