Cryptic crossword clue
Fellows in some muddled advisory group disagreeing with the PM? 3-7

The most common and most likely answer to this crossword clue is the 11 letter word OFF-MESSAGE

I've seen this crossword clue in Independent
O
F
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M
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Buddy explains!

The straight part
We know that "disagreeing with the PM?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disagreeing with the pm? = off-message.
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 OFF-MESSAGE mean?

OFF-MESSAGE adjective
  1. Publicly stating or supporting a policy counter to the official party policy.

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