More than one marriage was a little bit on the nose (6)
I believe the answer is:
bigamy
'more than one marriage' is the definition.
I can't judge whether this definition defines the answer.
'a little bit on the nose' is the wordplay.
'a little' means to remove the last letter (the word is not quite complete).
'on the nose' becomes 'gamy' (I can't explain this - if you can you should give a lot more credence to this answer).
'bit' with its final letter taken away is 'bi'.
'bi'+'gamy'='BIGAMY'
'was' is the link.
Can you help me to learn more?
(Other definitions for bigamy that I've seen before include "crime, perhaps" , "Instance of having two spouses" , "Crime of marrying while still married to another" , "In law, having two spouses at the same time" , "overmatiness" .)