Girl flipped about single type of fibre (5)
I believe the answer is:
sisal
'type of fibre' is the definition.
(I know that sisal is a type of plant fiber)
'girl flipped about single' is the wordplay.
I cannot really see how this works, but
'girl' could be 'isa' and 'isa' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sisal that I've seen before include "Plant fibre used for ropes" , "Agave rope-fibre" , "Agave cultivated for its fibre" , "Fibre-yielding plant" , "Hemp fibre" .)