Princess first in salon, back for quick Brazilian (5)
I believe the answer is:
senna
'quick brazilian' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'princess first in salon back' is the wordplay.
'princess' becomes 'Anne' (Princess Anne, daughter of Queen Elizabeth).
'first in salon' becomes 's' (1st letter of 'salon').
'back' is a reversal indicator.
'anne'+'s'='annes'
'annes' in reverse letter order is 'SENNA'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for senna that I've seen before include "taking this to speed up motion?" , "Natural laxative" , "Laxative from pods" , "Late driver" , "He drove fast" .)