Crossword Genius

Plain like old tyre? (4)

Ross

I believe the answer is:

bald

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

'plain' is the definition.
(both can mean unadorned)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bald that I've seen before include "Without hair" , "With no effort to conceal" , "Lacking hair on the scalp" , "Not covered with hair" , "Follicly challenged?" .)

I've seen this clue in The Sun.
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