Crossword Genius

Part of a pneumatic tyre (5,4)

Ross

I believe the answer is:

inner tube

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">part of a pneumatic tyre</span>' is the definition.<br/ ><span class="explanation-format__explanation">('inner tube' is part of 'pneumatic tyre')</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for inner tube that I've seen before include "inflatable ring" , "One used to inflation going by bicycle" , "Circle line?" , "rubber ring" , "What cyclist pumps up" .)

I've seen this clue in The Guardian and The Times.
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