Third cousin perhaps aloof corresponding (7,8)

I believe the answer is:

distant relative

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'third cousin' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'aloof corresponding' is the wordplay.
'aloof' becomes 'distant' (synonyms).
'corresponding' becomes 'relative' (I've seen this before).
'distant'+'relative'='DISTANT RELATIVE'

'perhaps' acts as a link.

Can you help me to learn more?

(Another definition for distant relative that I've seen is " Family member".)

I've seen this clue in The Guardian.

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