Cryptic crossword clue
Rev Spooner suggests superior makes fast mail merge site 6,3

The most common and most likely answer to this crossword clue is the 9 letter word LETTERBOX

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does LETTERBOX mean?

LETTERBOX noun
  1. A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose.
  2. A delivery point for mail, a box, compartment or slot for this purpose.
  3. A hidden container that holds a logbook and rubber stamp, found by following clues.
LETTERBOX verb
  1. To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area.
  2. To hunt for letterboxes (containers with logbook and rubber stamp) by following clues.
LETTERBOX adjective
  1. Transferred to home video formats while preserving the original aspect ratio, having black bars above and below the picture area.

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