Cryptic crossword clue
Jack’s replaced head of tool: it blocks signals 6

The most common and most likely answer to this crossword clue is the 6 letter word JAMMER

I've seen this crossword clue in The Guardian
J
A
M
M
E
R

Buddy explains!

The straight part
We know that "it blocks signals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it blocks signals = jammer.
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 JAMMER mean?

JAMMER noun
  1. Any device used to jam radio reception.
  2. A form of swimwear used by athletes.
  3. A musician who jams.
  4. A device (e.g. a jumar) which will slide along a rope in one direction but not the other, used in rock-climbing, caving etc.
  5. A player who attempts to score points by making their way past other players.

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