Regular correspondent (3,3)

I think it could be either:

Which length description are you looking for?:

3,3

3-6

pen pal

'regular correspondent' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for pen pal that I've seen before include "friendly writer" , "American friend via correspondence" , "A friendly correspondent" , "Friend who communicates in writing" , "juvenile writer" .)

I've seen this clue in The Times.

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