Salad plants seven I'd chopped up (7)
I believe the answer is:
endives
'salad plants' is the definition.
(I've seen this before)
'seven i'd chopped up' is the wordplay.
'chopped up' indicates anagramming the letters.
'seven'+'id'='sevenid'
'sevenid' with letters rearranged gives 'ENDIVES'.
(Other definitions for endives that I've seen before include "Plants related to chicory, used in salads" , "Herbs" , "'I'd seven plants, in a salad say (7)'" .)