Surface disorder in current bearing (4)

I believe the answer is:

acne

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

'surface disorder' is the definition.
'acne' can be an answer for 'disorder' (acne is a kind of health problem). I'm unsure of the 'surface' bit.

'current bearing' is the wordplay.
'current' becomes 'ac' (alternating current).
'bearing' becomes 'ne'.
'ac'+'ne'='ACNE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for acne that I've seen before include "Face problems" , "(Inflammation causing) spots" , "Adolescent spots" , "Skin complaint" , "Youthful problem" .)

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

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