Ancient people incorporated with the Anglo Saxons? (5)

I believe the answer is:

incas

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'ancient people' is the definition.
(people of the Inca Empire)

'incorporated with the anglo saxons?' is the wordplay.
'incorporated' becomes 'inc'.
'with' means one lot of letters go next to another.
'the anglo saxons?' becomes 'as' (this might be a standard abbreviation of which I'm unaware).
'inc'+'as'='INCAS'

Can you help me to learn more?

(Other definitions for incas that I've seen before include "Peruvian natives" , "Ancient inhabitants of Peru" , "Members of ancient Peruvian race" , "People of ancient Peru" , "South Americans whose empire fell to Spain" .)

I've seen this clue in the Evening Standard.

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