Relative sending a postcard? (13)

I believe the answer is:

corresponding

This clue is a double definition.

'relative' is the first definition.
(relating or corresponding to)

'sending a postcard?' is the second definition.
(postcard is a type of correspondence )

(Other definitions for corresponding that I've seen before include "Reciprocal" , "Conforming in every respect" .)

I've seen this clue in The Telegraph.

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