Cryptic crossword clue
Drink plenty of water having drunk hearty red 9

The most common and most likely answer to this crossword clue is the 9 letter word REHYDRATE

I've seen this crossword clue in Financial Times
R
E
H
Y
D
R
A
T
E

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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 REHYDRATE mean?

REHYDRATE verb
  1. To resupply with water that has been removed or lost; to moisten something that has dried.

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