The most common and most likely answer to this crossword clue is the 5 letter word LIKEN
I've seen this crossword clue in The Times
L
I
K
E
N
More clues leading to the result LIKEN
- Compare what one-kilogram bags brought over
- Compare Liberal president with nation's leader
- Tree cover perhaps said to generate correspondence
- Organism we hear and see in the same way
- Compare Liberal with President Clinton, ultimately
- Compare some fine kilts from behind
- Compare Liberal former president with new
- Compare plant with symbiotic fungus, say
- Compare man making revolution with king captured
- Draw a parallel with some people’s pronounced skin problem?
Buddy explains!

The straight part
We know that "generate correspondence" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case generate correspondence = liken.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 LIKEN mean?
LIKEN verb- (followed by to or unto) To compare; to state that (something) is like (something else).