The most common and most likely answer to this crossword clue is the 10 letter word CO-WORKERS
I've seen this crossword clue in The Guardian
C
O
-
W
O
R
K
E
R
S
Buddy explains!
The straight part
We know that "Ant ’n’ Dec say" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ant ’n’ dec say = co-workers.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 CO-WORKERS mean?
CO-WORKERS noun- Somebody with whom one works.