A million men love us being in love (7)
I believe the answer is:
amorous
'in love' is the definition.
(I've seen this before)
'a million men love us' is the wordplay.
'million' becomes 'm' (abbreviation).
'men' becomes 'or' (I've seen this in other clues).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'a'+'m'+'or'+'o'+'us'='AMOROUS'
'being' is the link.
(Other definitions for amorous that I've seen before include "Like lovers" , "Feeling or showing romantic love" , "Impassioned and loving" , "Fond" , "Possessed of loving or romantic feeling" .)