Inflexibility of editor involved in disastrous design phase (3-10)

I believe the answer is:

pig-headedness

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'inflexibility' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'editor involved in disastrous design phase' is the wordplay.
'editor' becomes 'ed' (abbreviation).
'involved in' is an insertion indicator.
'disastrous' indicates an anagram.
'design'+'phase'='designphase'
'designphase' is an anagram of 'pigheadness'.
'ed' put into 'pigheadness' is 'PIG-HEADEDNESS'.

'of' acts as a link.

Can you help me to learn more?

(Another definition for pig-headedness that I've seen is " Stupid obstinacy".)

I've seen this clue in The Independent.

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