Novel by Muriel Spark published in 1959 (7,4)

I believe the answer is:

memento mori

(Other definitions for memento mori that I've seen before include "skull perhaps" , "Reminder that death is inevitable (Latin)" , "A reminder of death's inevitability" , "Reminder of death (eg, skull) (Lat.)" , "Reminder of expiry" .)

I've seen this clue in The Independent.

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