Member of parliament penning article on non-governmental organisation's blunder (3,4)
I believe the answer is:
own goal
'blunder' is the definition.
'member of parliament penning article on non-governmental organisation's' is the wordplay.
'member of parliament' becomes 'owl' ('parliament' is the collective noun for 'owl').
'penning' is an insertion indicator.
'article' becomes 'a' (the indefinite article in English).
'on' is a charade indicator (letters next to each other).
'non governmental organisation's' becomes 'ngo' (this could be a standard abbreviation I've not previously seen).
'a' after 'ngo' is 'ngoa'.
'owl' going around 'ngoa' is 'OWN GOAL'.
Can you help me to learn more?
(Other definitions for own goal that I've seen before include "A score against self, as by soccer player" , "Shooting oneself in the foot" , "Disadvantageous move for the party making it" , "One may get back embarrassed" , "that gives advantage to opponents" .)