Right soot used on hair growth (5)
I believe the answer is:
roots
'right soot used on hair growth' is the definition.
I can't tell whether this defines the answer.
'right soot used on' is the wordplay.
'right' becomes 'r' (common abbreviation).
'used' indicates an anagram.
'on' means one lot of letters go next to another.
'soot' with letters rearranged gives 'oots'.
'r'+'oots'='ROOTS'
Can you help me to learn more?
(Other definitions for roots that I've seen before include "Antecedents" , "Genealogy" , "Cultural origins" , "Underground parts of plants" , "Cultural origin" .)