Cryptic crossword clue
What immediately follows a power signal 4

The most common and most likely answer to this crossword clue is the 4 letter word BEEP

I've seen this crossword clue in Independent
B
E
E
P

Buddy explains!

The straight part
We know that "signal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case signal = beep.
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 BEEP mean?

BEEP noun
  1. The sound produced by the horn of a car, or any similar sound.
  2. A short, electronically produced tone.
BEEP verb
  1. To sound (something that makes a beep).
  2. To have sexual intercourse (with) - referring to the bleep tone used to censor obscene words in broadcasts
  3. To produce a beep.
  4. To contact (someone via) a pager device.
  5. Telephoning a person, but only allowing the phone to ring once, in order to request a call back.

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