Crossword Genius

Lie about moral strength (5)

Ross

I believe the answer is:

fibre

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

'moral strength' is the definition.
'fibre' can be an answer for 'strength' (I have seen 'Strength of character ' mean 'fibre' so perhaps 'strength' could also mean 'fibre'). I am unsure of the 'moral' bit.

'lie about' is the wordplay.
'lie' becomes 'fib' (fibbing is a kind of liing).
'about' becomes 're' (common abbreviation for 'with reference to').
'fib'+'re'='FIBRE'

Can you help me to learn more?

(Other definitions for fibre that I've seen before include "Thread - strength of character" , "Thread, strand" , "Coarse plant food, low in nutrients" , "Dietary material; thread" , "Threadlike substance" .)

I've seen this clue in The Guardian and The Sun.
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