Crossword Genius

Resist plan by relation (6)

Ross

I believe the answer is:

sister

'relation' is the definition.
(I know that Sister is a type of sibling)

'resist plan' is the wordplay.
'plan' is an anagram indicator (plan can mean organise).
'resist' with letters rearranged gives 'SISTER'.

'by' acts as a link.

(Other definitions for sister that I've seen before include "Nurse, nun or relation" , "Member of family" , "A relative to resist" , "Tender" , "twin?" .)

I've seen this clue in The Mirror.
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