Ironing out source of disagreement in description of airship (3-5)

'description of airship' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'ironing out source of disagreement' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'source of' indicates taking the first letters (the start - or source - of the word).
The first letter of 'disagreement' is 'd'.
'ironing' with letters rearranged gives 'nonrigi'.
'nonrigi'+'d'='NON-RIGID'

'in' acts as a link.

Can you help me to learn more?