One of the politicians from D?il ?ireann is sowing the seeds of something big perhaps
I believe the answer is:
greenhouse
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for greenhouse that I've seen before include "somewhere hot" , "Glass building for rearing plants" , "Horticulturalists' glass building" , "A place for growing" , "see-through construction" .)