Love shown by wise man in Siouan language (5)

I believe the answer is:

osage

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'siouan language' is the definition.
'osage' can be an answer for 'language' (I've seen this before). I'm not certain of the 'siouan' bit.

'love shown by wise man' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'shown by' says to put letters next to each other.
'wise man' becomes 'sage' (sage is a kind of wise man).
'o'+'sage'='OSAGE'

'in' is the link.

Can you help me to learn more?

(Other definitions for osage that I've seen before include "People of America" , "Age so (anag) - member of a Native American people" , "Indians" , "Native Americans from Missouri - age so (anag)" , "member of tribe" .)

I've seen this clue in The Times.

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