Almost regretting the Spanish salad plant (6)
I believe the answer is:
sorrel
'salad plant' is the definition.
'sorrel' can be an answer for 'plant' (sorrel is a kind of plant). I am not sure about the 'salad' bit.
'almost regretting the spanish' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'regretting' becomes 'sorry' (if you're sorry for something you're regretting it).
'the spanish' becomes 'el' ('the' in Spanish).
'sorry' with its last letter taken off is 'sorr'.
'sorr'+'el'='SORREL'
Can you help me to learn more?
(Other definitions for sorrel that I've seen before include "Type of horse" , "Light brown: salad leaf" , "Edible plant, horse of light reddish-brown coat" , "Light-chestnut horse" , "Horse of reddish-brown colour" .)