Primate in two remote marshes primarily an invasive species? (8)
I believe the answer is:
tapeworm
'an invasive species?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'primate in two remote marshes primarily' is the wordplay.
'primate' becomes 'ape' (large primate).
'in' indicates putting letters inside.
'primarily' suggests taking the first letters.
The initial letters of 'remote marshes' is 'rm'.
'ape' put within 'two' is 'tapewo'.
'tapewo'+'rm'='TAPEWORM'
Can you help me to learn more?
(Other definitions for tapeworm that I've seen before include "Internal parasite" , "Intestinal parasite" , "Ribbon-like parasite inhabiting the gut" , "Sucker" , "Human parasite" .)