Organisation receiving articles about stomach in the ape (5-5)

'ape' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'organisation receiving articles about stomach in the' is the wordplay.
'organisation' becomes 'org' (common abbreviation).
'receiving' is an insertion indicator.
'articles' becomes 'anan' (the indefinite article 'an', twice).
'about stomach' becomes 'gut' (I've seen this before. I am not sure about the 'about' bit.).
'in the' indicates putting letters inside.
'org' going around 'anan' is 'oranang'.
'oranang' enclosing 'gut' is 'ORANG-UTANG'.

Can you help me to learn more?