Biased to some extent (7)

I believe the answer is:

partial

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'biased' is the definition.
(similar in meaning)

'some extent' is the wordplay.
'some' becomes 'part' (only part of something).
'extent' becomes 'ial' (I am not sure about this - if you are sure you should believe this answer much more).
'part'+'ial'='PARTIAL'

'to' is the link.

Can you help me to learn more?

(Other definitions for partial that I've seen before include "Keen" , "Biased or incomplete" , "Fragmentary" , "Not complete or whole" , "Fond of" .)

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

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