The most common and most likely answer to this crossword clue is the 11 letter word GO-BETWEENS
G
O
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B
E
T
W
E
E
N
S
Buddy explains!
The straight part
We know that "liaisons" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case liaisons = go-betweens.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 GO-BETWEENS mean?
GO-BETWEENS noun- An intermediary or middleman.
- A shogi piece, used in chu shogi and larger shogi variants, that can move one step straight forward or straight backwards.