It might enhance domestic harmony, if iron is hung differently? (4,4)
I believe the answer is:
feng shui
'it might enhance domestic harmony' is the definition.
I know nothing about this answer so I can't tell whether this works.
'iron is hung differently?' is the wordplay.
'iron' becomes 'Fe' (Fe is the chemical symbol for iron).
'differently?' indicates anagramming the letters (I've seen 'differently' mean this).
'is'+'hung'='ishung'
'ishung' anagrammed gives 'ngshui'.
'fe'+'ngshui'='FENG SHUI'
'if' acts as a link.
Can you help me to learn more?
(Other definitions for feng shui that I've seen before include "Rules in Chinese philosophy that govern energy flow" , "Chinese principles of the flow of energy in buildings" , "Chinese system of energy flows" , "Chinese art of harmonious placement" , "guide to oriental building" .)