The most common and most likely answer to this crossword clue is the 8 letter word DECODERS
I've seen this crossword clue in The Daily Telegraph
D
E
C
O
D
E
R
S
More clues leading to the result DECODERS
Buddy explains!
The straight part
We know that "‘Morse’ may be intelligible to such folk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ‘morse’ may be intelligible to such folk = decoders.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 DECODERS mean?
DECODERS noun- A person who decodes secret messages
- A device that decodes a scrambled electronic signal e.g. of a satellite television signal