Twice the trouble and strife in such a state? (6)
I believe the answer is:
bigamy
'such a state?' is the definition.
(bigamy is a kind of state)
'twice the trouble and strife' is the wordplay.
'twice' becomes 'bi' (eg biannual, biweekly).
'the trouble and strife' becomes 'gamy' (I can't justify this - if you can you should give a lot more credence to this answer).
'bi'+'gamy'='BIGAMY'
'in' is the link.
(Other definitions for bigamy that I've seen before include "Marital crime" , "Crime involving marriage(s)" , "State of having two spouses at one time" , "Crime of marrying while still married to another" , "overmatiness" .)