Cryptic crossword clue
Radio set working – as this valve appears? 6

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

T
R
I
O
D
E

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

TRIODE noun
  1. A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode, which makes amplification possible.

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