Dry up petrol supply, going by claims (11)
I believe the answer is:
purportedly
'going by claims' is the definition.
(purportedly means according to claims)
'dry up petrol supply' is the wordplay.
'supply' indicates an anagram (in a supple way).
'dry'+'up'+'petrol'='dryuppetrol'
'dryuppetrol' with letters rearranged gives 'PURPORTEDLY'.
I've seen this clue in The Times.
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