26 across
Idiot
stealing
contents
of
bicycle
rack
(4)
Idiot stealing contents of bicycle rack (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Idiot, giving us BERK (a slang term for a fool). The wordplay instructs us to take "bicycle rack" and steal (remove) their contents — that is, strip out the inner letters of each word. BICYCLE loses its contents (ICYCL) to leave B and E, and RACK loses its contents (AC) to leave R and K. Put together: B-E-R-K.