Important little woman causing marital offence (6)

I believe the answer is:

bigamy

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'marital offence' is the definition.
'bigamy' can be an answer for 'offence' (I've seen this before). I am unsure of the 'marital' bit.

'important little woman' is the wordplay.
'important' becomes 'big' (synonyms).
'little woman' becomes 'Amy' (character from the novel Little Women).
'big'+'amy'='BIGAMY'

'causing' acts as a link.

Can you help me to learn more?

(Other definitions for bigamy that I've seen before include "Having two concurrent spouses" , "Crime of double marriage" , "overmatiness" , "Crime of marrying while still married to another" , "Marrying one person while married to another" .)

I've seen this clue in The Irish Times.

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