Anti-labour slogan in this sub-Saharan speech? (5)

I believe the answer is:

bantu

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'sub-saharan speech?' is the definition.
(group of African languages)

'anti-labour slogan in' is the wordplay.
'anti' becomes 'ant' (synonyms).
'labour slogan' becomes 'bu' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'ant' placed inside 'bu' is 'BANTU'.

'this' acts as a link.

Can you help me to learn more?

(Other definitions for bantu that I've seen before include "Group of Niger-Congo languages" , "African language group" , "10 across language" , "African tongue" , "A language and people of Africa" .)

I've seen this clue in The Guardian.

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