Cryptic crossword clue
Beach alarm blocked by old unspecified people 2-3-3

The most common and most likely answer to this crossword clue is the 10 letter word SO-AND-SOS

I've seen this crossword clue in Independent
S
O
-
A
N
D
-
S
O
S

Buddy explains!

The straight part
We know that "unspecified people" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unspecified people = so-and-sos.
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 SO-AND-SOS mean?

SO-AND-SOS noun
  1. A placeholder name for a person or thing, used when a name is not known; a generic name.
  2. Some thing or things.
  3. Used for epithets such as SOB, bastard, etc..

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