Special clearing up session’s conclusion? (6-5)

I believe the answer is:

spring-clean

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'special clearing up session's conclusion?' is the definition.
I can't judge whether this defines the answer.

'special clearing up session's conclusion?' is the wordplay.
'special' becomes 'sp' (abbreviation).
'up' indicates an anagram (letters get chucked up).
'conclusion?' says to take the final letters (I've seen 'conclusion' mean this).
The final letter of 'session' is 'n'.
'clearing' is an anagram of 'ringclea'.
'sp'+'ringclea'+'n'='SPRING-CLEAN'

Can you help me to learn more?

(Other definitions for spring-clean that I've seen before include "Annual going over of a home" , "Give (a house) a good going over" .)

I've seen this clue in The Times.

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