Cryptic crossword clue
Formal show of appreciation, given actor playing R Langdon’s cross? 4,2,6

The most common and most likely answer to this crossword clue is the 4 plus 2 plus 6 letter word VOTE OF THANKS

I've seen this crossword clue in Financial Times
V
O
T
E
O
F
T
H
A
N
K
S

Buddy explains!

The straight part
We know that "Formal show of appreciation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case formal show of appreciation = vote of thanks.
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.

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