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Disgusting prank in picnic (9)

Ross

I believe the answer is:

outraging

'disgusting' is the definition.
(outraging is a kind of disgusting)

'prank in picnic' is the wordplay.
'prank' becomes 'rag' (rag is a kind of prank).
'in' means one lot of letters goes inside another.
'picnic' becomes 'outing' (synonyms).
'rag' inserted into 'outing' is 'OUTRAGING'.

(Another definition for outraging that I've seen is " infuriating".)

I've seen this clue in The Hindu.
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