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Odd
you
twice
caught
group
of
students
drawn
in
by
unframed
Dali
(7)
Odd you twice caught group of students drawn in by unframed Dali (7)
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The definition is at the beginning of the clue.
How the clue works
Odd is the definition. "You" sounds like the letter U, and "twice caught" means we take it twice — these go around NUS (National Union of Students, the group of students "drawn in"), giving UNUSU. Then "unframed Dali" strips the outer letters off DALI to leave AL, which tacks on the end for UNUSUAL.