Stupid alien found in underbrush (7)
I believe the answer is:
thicket
'in underbrush' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'stupid alien' is the wordplay.
'stupid' becomes 'thick' (similar in meaning).
'alien' becomes 'et' (extra terrestrial).
'thick'+'et'='THICKET'
'found' acts as a link.
Can you help me to learn more?
(Other definitions for thicket that I've seen before include "close gathering of elders?" , "Dense mass of trees or shrubs" , "Wood" , "A patch of shrubs and small trees" , "Coppice" .)