Welsh rabbit (7)
I believe the answer is:
rarebit
'welsh rabbit' is the definition.
(synonyms)
This is all the clue.
(Other definitions for rarebit that I've seen before include "Cheesy snack" , "Arbiter of Welsh dish with melted cheese on toast" , "which the Welsh take down?" , "cheesy meal" , "Cooked cheese on toast" .)