Using which one might no longer be distressed
I believe the answer is:
hair restorer
'using' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?
'one might no longer be distressed' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is found in the answer.
'be' could be 'rest' (resting is a kind of being) and 'rest' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'which' is the link.
Can you help me to learn more?
(Other definitions for hair restorer that I've seen before include "application for fringe benefits?" , "Something to reverse baldness" , "Substance applied to a balding scalp" , "Preparation claiming to reverse alopecia" , "Cure for baldness" .)