Cryptic crossword clue
Robust address being heard 4

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

H
A
L
E

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The straight part
We know that "Robust" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case robust = hale.
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 HALE mean?

HALE noun
  1. Health, welfare.
HALE adjective
  1. Sound, entire, healthy; robust, not impaired.
HALE verb
  1. To drag or pull, especially forcibly.

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