Crab meat is served over one type of grain (7,4)

I believe the answer is:

basmati rice

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'type of grain' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'crab meat is served over one' is the wordplay.
'served' indicates anagramming the letters.
'over' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'crab'+'meat'+'is'='crabmeatis'
'crabmeatis' anagrammed gives 'basmatirce'.
'basmatirce' enclosing 'i' is 'BASMATI RICE'.

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(Another definition for basmati rice that I've seen is " Long-grained food".)

I've seen this clue in The Telegraph.

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