Lie about strength of character (5)

I believe the answer is:

fibre

'strength of character' is the definition.
(I've seen this before)

'lie about' is the wordplay.
'lie' becomes 'fib' (fibbing is a kind of liing).
'about' becomes 're' (regarding).
'fib'+'re'='FIBRE'

(Other definitions for fibre that I've seen before include "Brief (anag.)" , "Texture - strength of character" , "Thread - strength of character" , "Long fine thread" , "Textile thread; roughage" .)

I've seen this clue in The Guardian, The Times and The Telegraph.

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