In all, no improvement detected using this ointment (7)

I believe the answer is:

lanolin

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'this ointment' is the definition.
(lanolin is a kind of ointment)

'in all no improvement detected' is the wordplay.
'in all no' anagrams to 'LANOLIN'.
However, I'm unsure how this is indicated.

'using' acts as a link.

Can you help me to learn more?

(Other definitions for lanolin that I've seen before include "Substance found on sheep's wool" , "Wool fat used in ointments" , "Ointment containing wool fat" , "Oil extracted from wool" , "Wool-fat" .)

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

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