26 across
Turkish
bigwig
covers
arse,
it
may
be
hidden
(6)
Turkish bigwig covers arse, it may be hidden (6)
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The definition is at the end of the clue.
How the clue works
Right, so it may be hidden is your definition there — think "hidden agenda". For the wordplay, take AGA, your Turkish bigwig, and wrap it round END (that's your arse, the rear end), giving you AG-END-A.