31 across
Call
for
help
preserves
university
lecturer’s
spirits
(5)
Call for help preserves university lecturer’s spirits (5)
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The definition is at the end of the clue.
How the clue works
Look at spirits — that's your definition. SOS (call for help) "preserves" (i.e., contains) U (university) and L (lecturer) tucked inside it, giving you S with U and L sandwiched in there, and then S again to close it off.