Lots of bacteria in part of the gut unknown (6)
I believe the answer is:
colony
'lots of bacteria in part' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'the gut unknown' is the wordplay.
'the gut' becomes 'colon' (colon is a kind of gut).
'unknown' becomes 'y' (algebra).
'colon'+'y'='COLONY'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for colony that I've seen before include "Country controlled by another's settlers" , "Overseas settlement" , "It is settled" , "New settlement abroad" , "Dependency" .)