Crossword Genius

Antiseptic creams or soap? Test half of each (8)

Ross

I believe the answer is:

creosote

'antiseptic' is the definition.
(creosote can be used as an antiseptic)

I don't understand the remainder of the clue.

(Other definitions for creosote that I've seen before include "Dark oily liquid, preservative for wood" , "Wood treatment" , "Wood preserver made from coal tar" , "Fencing gear, perhaps" , "Oily excretion" .)

I've seen this clue in The Independent.
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