The most common and most likely answer to this crossword clue is the 10 letter word CATCHMENTS
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Buddy explains!
The straight part
We know that "Service areas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case service areas = catchments.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 CATCHMENTS mean?
CATCHMENTS noun- Any structure or land feature which catches and holds water; the collection of such water.
- A catchment area, or the people it serves.