Plant that tastes awful trimmed roughly (5)
I believe the answer is:
yucca
'plant' is the definition.
'tastes awful trimmed roughly' is the wordplay.
I cannot really understand how this works, but
'roughly' could be 'ca' (abbreviation for circa) and 'ca' is found within the answer.
This explanation may well be incorrect...
'that' acts as a link.
Can you help me to learn more?
(Other definitions for yucca that I've seen before include "Spiky-leaved plant" , "Cassava" , "House plant with spiky flowers" , "Ornamental plant" , "tapioca!" .)