Sissy’s room for the weekend (6)

I believe the answer is:

spacek

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'sissy's' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'room for the weekend' is the wordplay.
'room' becomes 'space' (I've seen this before).
'for' is a charade indicator (letters next to each other).
'the weekend' becomes 'k' (I've seen this in other clues).
'space'+'k'='SPACEK'

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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