Unusual part of Welsh dish? (7)
I believe the answer is:
rarebit
'welsh dish?' is the definition.
(I've seen this in another clue)
'unusual part' is the wordplay.
'unusual' becomes 'rare' (rare can mean unusual or odd).
'part' becomes 'bit' (both mean a piece of something).
'rare'+'bit'='RAREBIT'
'of' acts as a link.
(Other definitions for rarebit that I've seen before include "Arbiter of tasty Welsh dish of cheese on toast" , "Arbiter of traditional Welsh dish" , "Cheesy snack" , "Cheese/toast savoury" , "Melted cheese on hot toast" .)