Cryptic crossword clue
Walker’s exultant here when red light’s visible 2,3

The most common and most likely answer to this crossword clue is the 2 plus 3 letter word ON AIR

O
N
A
I
R


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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 ON AIR mean?

ON AIR adjective
  1. Broadcast (as opposed to recorded).
ON AIR adverb
  1. Actually broadcasting on a radio or television station (as opposed to just recording for later transmission).

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