Crossword Genius

Took the part of another (5)

Ross

I believe the answer is:

sided

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'took' is the definition.
(siding is a kind of taking)

'part of another' is the wordplay.
'part' becomes 'si' (si is a kind of part).
'of another' becomes 'ded' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'si'+'ded'='SIDED'

'the' is the link.

Can you help me to learn more?

(Other definitions for sided that I've seen before include "Allied oneself (with one party)" , "Took part with person in a dispute" , "Showed solidarity (with)" .)

I've seen this clue in The Globe and Mail.
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