Weed with no name, ultimately (3)
I believe the answer is:
hoe
'weed' is the definition.
(I've seen this in another clue)
'with no name ultimately' is the wordplay.
'ultimately' says to take the final letters.
The final letters of 'with no name' are 'HOE'.
(Other definitions for hoe that I've seen before include "Purple gem" , "Plymouth - -" , "Use garden tool" , "Weeder" , "Garden implement" .)