Crossword Genius

Insult 51 in complaint is 'an inability to accept the truth' (9)

Ross

I believe the answer is:

disbelief

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

'an inability to accept the truth' is the definition.
I can't tell whether this defines the answer.

'insult 51 in complaint' is the wordplay.
'insult' becomes 'dis' (shortened form of 'disrespect' - slang).
'5d' becomes 'LI' (roman numeral).
'in' indicates putting letters inside.
'complaint' becomes 'beef' (beef can mean a complaint or objection).
'li' inserted into 'beef' is 'belief'.
'dis'+'belief'='DISBELIEF'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for disbelief that I've seen before include "Refusal to advance credit" , "Lack of faith" , "having exhausted trust fund?" , "Incredulity" .)

I've seen this clue in The Independent.
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