In plate, an accompaniment to coffee (6)
I believe the answer is:
danish
'accompaniment to coffee' is the definition.
(I've seen this before)
'in plate an' is the wordplay.
'in' indicates putting letters inside.
'plate' becomes 'dish' (I've seen this before).
'dish' placed around 'an' is 'DANISH'.
(Other definitions for danish that I've seen before include "Popular piece of pastry" , "course includes article / noun combination" , "Like Hans Andersen" , "Flat cake - and party's his! (anag)" , "_ blue; type of cheese" .)