The most common and most likely answer to this crossword clue is the 6 plus 4 letter word DOUBLE ACTS
I've seen this crossword clue in Financial Times
D
O
U
B
L
E
A
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S
More clues leading to the result DOUBLE ACTS
Buddy explains!
The straight part
We know that "Couples who may make one laugh" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case couples who may make one laugh = double acts.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.