Crossword Genius

She may be relatively disposed to resist (6)

Ross

I believe the answer is:

sister

I'm a little stuck... Click here to teach me more about this clue!

'she may be relatively' is the definition.
I can't judge whether this definition defines the answer.

'disposed to resist' is the wordplay.
'disposed' is an anagram indicator.
'resist' is an anagram of 'SISTER'.

Can you help me to learn more?

(Other definitions for sister that I've seen before include "habits' - one who has them" , "of the same origin" , "Female sibling" , "Senior nurse; relative" , "Martin --, film director" .)

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