Aerodynamic part of a piston (3)

I believe the answer is:

rod

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'a piston' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'aerodynamic part' is the wordplay.
'part' indicates a hidden word.
'ROD' is hidden within 'aerodynamic'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for rod that I've seen before include "Wand - fishing stick" , "Rigid stick" , "Angler's equipment" , "Measurement" , "Straight, slender stick" .)

I've seen this clue in the Evening Standard.

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