Start of terrible split about husband's frugality (6)
I believe the answer is:
thrift
'start of terrible split about husband's frugality' is the definition.
'thrift' can be an answer for 'frugality' (thrift is a kind of frugality). I am not certain of the 'start of terrible split about husband's' bit.
'split about husband's frugality' is the wordplay.
'split' becomes 'rift' (I've seen this in another clue).
'about' means one lot of letters go next to another.
'husband's frugality' becomes 'th' (I am not sure about this - if you are sure you should believe this answer much more).
'rift' after 'th' is 'THRIFT'.
Can you help me to learn more?
(Other definitions for thrift that I've seen before include "Careful spending" , "Parsimony, penny-pinching" , "Maritime growth" , "Careful control of resources" , "Carefulness with money" .)