King and queen on a Swedish coin (5)
I believe the answer is:
krona
'swedish coin' is the definition.
(I've seen this in another clue)
'king and queen on a' is the wordplay.
'king' becomes 'K' (abbreviation for king in chess).
'and' means one lot of letters go next to another.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'k'+'r'+'on'+'a'='KRONA'
(Other definitions for krona that I've seen before include "Scandinavian capital" , "cash" , "Swedish currency unit" , "Basic unit of money in Sweden" , "Swedish monetary unit" .)