Lettuce, rice (and giblet, oddly enough) in salad (7)
I believe the answer is:
iceberg
'lettuce' is the definition.
(iceberg lettuce is a kind of lettuce)
'rice and giblet oddly enough in salad' is the wordplay.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'oddly enough' means one should take alternating letters.
'in salad' is an anagram indicator.
The alternating letters of 'giblet' are 'gbe'.
'rice' put after 'gbe' is 'gberice'.
'gberice' anagrammed gives 'ICEBERG'.
(Other definitions for iceberg that I've seen before include "Mass calved from a glacier" , "Hazard in Arctic sea" , "Arctic shipping hazard" , "Large mass of floating ice" , "A floating ice mountain" .)