The most common and most likely answer to this crossword clue is the 8 letter word CASEWORK
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More clues leading to the result CASEWORK
Buddy explains!

The straight part
We know that "Social service" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case social service = casework.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 CASEWORK mean?
CASEWORK noun- The work required to deal with cases in any profession where a "case" has a specific definition (e.g. legal, social work, planning, etc.).