The most common and most likely answer to this crossword clue is the 9 letter word FORESHORE
I've seen this crossword clue in The Guardian
F
O
R
E
S
H
O
R
E
Buddy explains!

The straight part
We know that "Strand /Strand" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strand /strand = foreshore.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 FORESHORE mean?
FORESHORE noun- The part of a shore between high water and low water, especially the beach exposed at maximum ebb spring tides.