Cryptic crossword clue
Awfully cosy when meeting power, hard workers who toady 10

The most common and most likely answer to this crossword clue is the 10 letter word SYCOPHANTS

I've seen this crossword clue in The Guardian
S
Y
C
O
P
H
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S

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The straight part
We know that "who toady" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case who toady = sycophants.
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 SYCOPHANTS mean?

SYCOPHANTS noun
  1. One who uses obsequious compliments to gain self-serving favor or advantage from another; a servile flatterer.
  2. One who seeks to gain through the powerful and influential.
  3. An informer; a talebearer.

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