Crossword Genius

Smooth driver? (4)

Ross

I believe the answer is:

iron

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'smooth' is the first definition.
(to smooth down with an iron)

'driver?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for iron that I've seen before include "inflexible > club" , "Main component of steel" , "Flatten; element" , "Very robust" , "Metal - press" .)

I've seen this clue in The Globe and Mail.
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