Cryptic crossword clue
Solicitude, mark of affection for waterside plant 5

The most common and most likely answer to this crossword clue is the 5 letter word CAREX

C
A
R
E
X

Buddy explains!

The straight part
We know that "waterside plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case waterside plant = carex.
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 CAREX mean?

CAREX noun
  1. Any member of the genus Carex of sedges.

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