Doddery elder aunt, not linked by blood (9)

I believe the answer is:

unrelated

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'doddery elder aunt not linked by blood' is the definition.
I can't tell whether this definition defines the answer.

'doddery elder aunt' is the wordplay.
'doddery' indicates an anagram.
'elder'+'aunt'='elderaunt'
'elderaunt' with letters rearranged gives 'UNRELATED'.

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(Other definitions for unrelated that I've seen before include "Having no (family) connection" , "Not linked" , "Irrelevant" , "beside the point" .)

I've seen this clue in The Telegraph.

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