To flood moat with salad ingredient (6)
I believe the answer is:
'salad ingredient' is the definition.
(I've seen this in another clue)
'to flood moat' is the wordplay.
I cannot quite see how this works, but
'to' is within the answer.
an anagram of 'moat' is 'mato' which is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'with' acts as a link.
Can you help me to learn more?
(Other definitions for tomato that I've seen before include "Also called the love apple", "Salad fruit or berry", "A motto, strangely, for this fruit", "Part of a BLT sandwich", "Love apple (or "beef" fruit?)".)