Crossword Genius

Uniform covered in strong-smelling, phosphorus-free ointment (7)

Ross

I believe the answer is:

unguent

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'ointment' is the definition.
(synonyms)

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(Other definitions for unguent that I've seen before include "application" , "Oily substance" , "Lubricant to tune gun" , "Balm, ointment" , "Lotion" .)

I've seen this clue in The Independent.
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