Pen pal? (3)
'pen pal?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pig that I've seen before include "One scoffs" , "Greedy person (colloq.)" , "& 16 Animal pen" , "Farmyard animal" , "Mass of metal simply cast" .)
(Other definitions for hog that I've seen before include "Pig, who holds the road perhaps" , "source of meat" , "Pig reared for slaughter" , "Gourmand" , "Pig; hoard selfishly" .)
'pen pal?' is the definition.
(pen pal is a kind of correspondent)
This is all the clue.
(Other definitions for correspondent that I've seen before include "Newspaper writer" , "Journalist; letter-writer" , "Reporter on special subject or from overseas" , "Reporter on specialist areas" , "Journalist; letter writer" .)