She's made to resist relatively speaking (6)

I believe the answer is:

sister

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

'speaking' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

'she's made to resist relatively' is the wordplay.
'resist' can be anagrammed to 'SISTER'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sister that I've seen before include "Relative in hospital?" , "'Nurse, nun or relative (6)'" , "Tender" , "A kinswoman" , "Close relation" .)

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

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