Crossword Genius

Invasive presence in part of the bowel is extremely eager (9)

Ross

I believe the answer is:

coloniser

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'invasive presence in' is the definition.
The definition suggests a singular noun which matches the answer.

'the bowel is extremely eager' is the wordplay.
'the bowel' becomes 'colon' (colon is a kind of bowel).
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'eager' with its middle taken out is 'er'.
'colon'+'is'+'er'='COLONISER'

'part of' is the link.

Can you help me to learn more?

(Other definitions for coloniser that I've seen before include "One's part of the settled establishment" , "Settler in new area" .)

I've seen this clue in The Guardian.
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