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Indulgence
of
endlessly
pilfered
allowance
(10)
Indulgence of endlessly pilfered allowance (10)
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The definition is at the beginning of the clue.
How the clue works
Indulgence is the definition here, in the sense of putting up with something. For the wordplay, take STOLEN (that's your "pilfered") and lop off both ends, as "endlessly" tells you, which leaves TOLE. Then tack on RATION (the "allowance") and you've got your answer.