4 down
Religious
literature
mother
smuggled
out
of
mountainous
island
(5)
Religious literature mother smuggled out of mountainous island (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Religious literature — a sutra being a sacred text. The wordplay has you taking mountainous island SUMATRA and "smuggling out" mother (MA) to leave what's left behind.