Similar to a number of relatives (4)

I believe the answer is:

akin

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'similar to' is the definition.
(I've seen this in another clue)

'a number of relatives' is the wordplay.
'number of relatives' becomes 'kin' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'kin'='AKIN'

Can you help me to learn more?

(Other definitions for akin that I've seen before include "Similar in quality" , "Close" , "Related or similar - as a relative?" , "Related by blood" , "not totally similar" .)

I've seen this clue in the Sydney Morning Herald.

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