Passionate Australian given another room with American (7)
I believe the answer is:
amorous
'passionate' is the definition.
(similar in meaning)
'australian given another room with american' is the wordplay.
'australian' becomes 'a'.
'given' means one lot of letters go next to another.
'another' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'american' becomes 'us' (abbreviation for United States).
'room' anagrammed gives 'moro'.
'a'+'moro'+'us'='AMOROUS'
(Other definitions for amorous that I've seen before include "Possessed of loving or romantic feeling" , "In loving mood" , "Expressing love" , "Inclined towards displaying love" , "Relating to love" .)