Crossword Genius

Speak falsely about stamina (5)

Ross

I believe the answer is:

fibre

I'm a little stuck... Click here to teach me more about this clue!

'speak falsely about stamina' is the definition.
I can't tell whether this definition defines the answer.

'speak falsely about' is the wordplay.
'speak falsely' becomes 'fib' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' becomes 're' (regarding).
'fib'+'re'='FIBRE'

Can you help me to learn more?

(Other definitions for fibre that I've seen before include "(Material composed of) thread(s)" , "Thread - strength of character" , "Coarse plant food, low in nutrients" , "Textile thread; roughage" , "Dietary material; thread" .)

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