Cryptic crossword clue
Shared an understanding with shyest maid, trembling, keeping quiet 11

The most common and most likely answer to this crossword clue is the 11 letter word SYMPATHISED

I've seen this crossword clue in The Daily Telegraph
S
Y
M
P
A
T
H
I
S
E
D

Buddy explains!

The straight part
We know that "Shared an understanding" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shared an understanding = sympathised.
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 SYMPATHISED mean?

SYMPATHISED verb
  1. To have, show or express sympathy; to be affected by feelings similar to those of another, in consequence of knowing the person to be thus affected.
  2. To support, favour, have sympathy (with a political cause or movement, a side in a conflict / in an action).
  3. To say in an expression of sympathy.
  4. To have a common feeling, as of bodily pleasure or pain.
  5. To share (a feeling or experience).
  6. To agree; to be in accord; to harmonize.

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