Cryptic crossword clue
Water plant or shrub vigorously about mid-July 7

The most common and most likely answer to this crossword clue is the 7 letter word BULRUSH

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Water plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case water plant = bulrush.
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 BULRUSH mean?

BULRUSH noun
  1. Any of several wetland plants, mostly in the family Cyperaceae (the sedges):

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