Correspondent and prison priest dine out (3,6)
I believe the answer is:
pen friend
'correspondent' is the definition.
(I have seen 'Regular correspondent ' mean 'pen friend' so perhaps 'correspondent' could also mean 'pen friend')
'prison priest dine out' is the wordplay.
'prison' becomes 'pen' (I've seen this in another clue).
'priest' becomes 'fr' (abbreviation as in a priest's title).
'out' indicates an anagram (out can mean wrong or inaccurate).
'dine' with letters rearranged gives 'iend'.
'pen'+'fr'+'iend'='PEN-FRIEND'
'and' is the link.
(Other definitions for pen friend that I've seen before include "Pal writing" , "A pal through correspondence, never met" , "Pal to correspond with" , "Regular correspondent" , "Foreign correspondent" .)