Cryptic crossword clue
Communication system gets sign of approval by board 4-4

The most common and most likely answer to this crossword clue is the 9 letter word TICK-TACK

I've seen this crossword clue in Financial Times
T
I
C
K
-
T
A
C
K

Buddy explains!

The straight part
We know that "Communication system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case communication system = tick-tack.
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 TICK-TACK mean?

TICK-TACK noun
  1. A system of sign language used by bookmakers at racecourses to communicate odds and bets; an associated group of words for each sign
TICK-TACK noun
  1. The sound of repeated tapping, knocking, or clicking.
  2. A device used to tap on a window or door from a distance.

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