Anticipated importing oddly less seafood (5)
I believe the answer is:
Here is my best explanation:
'seafood' is the definition.
(type of edible seaweed)
'anticipated importing oddly less' is the wordplay.
'anticipated' becomes 'due' ('due' can be similar in meaning to 'anticipated').
'importing' means one lot of letters goes inside another.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternate letters of 'less' are 'ls'.
'due' placed around 'ls' is 'DULSE'.
(Other definitions for dulse that I've seen before include "Seaweed", "Edible seaweed" and "Red-fronded seaweed".)