Bird, black and gold, rising over one end of garden (5)
I believe the answer is:
robin
'bird' is the definition.
(I know that robin is a type of thrush)
'black and gold rising over one end of garden' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'and' means one lot of letters go next to another.
'gold rising over' becomes 'ro' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one' becomes 'i' (Roman numeral).
'end of' says to take the final letters.
The last letter of 'garden' is 'n'.
'b' put after 'ro' is 'rob'.
'rob'+'i'+'n'='ROBIN'
Can you help me to learn more?
(Other definitions for robin that I've seen before include "Bird - boy's name" , "Bird - one in Lincoln green?" , "Christmas songbird" , "Small brown and red bird" , "Garden bird" .)