Cryptic crossword clue
GPO hail her quirky communications device 10

The most common and most likely answer to this crossword clue is the 10 letter word HELIOGRAPH

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "communications device" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case communications device = heliograph.
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 HELIOGRAPH mean?

HELIOGRAPH noun
  1. An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
  2. A heliogram.
  3. An instrument for measuring the intensity of sunlight.
  4. A device for photographing the sun.
  5. A photograph.
HELIOGRAPH verb
  1. To send a message by heliograph.
  2. To send a heliograph.
  3. To photograph by sunlight.

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