Sketch oblong section for connecting piece (7)

I believe the answer is:

drawbar

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'connecting piece' is the definition.
The definition suggests a singular noun which matches the answer.

'sketch oblong section' is the wordplay.
'sketch' becomes 'draw' (I've seen this in another clue).
'oblong section' becomes 'bar' (I can't justify this - if you can you should give a lot more credence to this answer).
'draw'+'bar'='DRAWBAR'

'for' acts as a link.

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I've seen this clue in the Sydney Morning Herald.

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