Could be in the White House garden (4)
I believe the answer is:
bush
'garden' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'could be in the white house' is the wordplay.
I cannot quite understand how this works, but
'house' could be 'h' and 'h' is found in the answer.
The remaining letters 'bus' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bush that I've seen before include "Scrub" , "41st US president, George" , "Low, woody plant" , "Shrub; protective sleeve" , "ex-president" .)