Last of the carrots on the plot, perhaps? (6)
I believe the answer is:
plants
'last of the carrots' is the definition.
The definition and answer can be both plants as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'on the plot perhaps?' is the wordplay.
'on' means one lot of letters go next to another.
'the plot' becomes 'plan' (I've seen this before).
'perhaps?' becomes 'ts' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'plan'+'ts' is 'PLANTS'.
Can you help me to learn more?
(Other definitions for plants that I've seen before include "Trees, shrubs etc." , "Settles" , "Flora" , "Puts into the ground to grow" , "Sets seeds in the ground" .)