Company splashing money around, not practising this (7)
I believe the answer is:
economy
'not practising this' is the definition.
The definition suggests a singular noun which matches the answer.
'company splashing money around' is the wordplay.
'company' becomes 'co' (abbreviation).
'splashing' is an anagram indicator (I've seen 'splashing of' mean this (I've seen this in other clues)).
'around' is an insertion indicator.
'money' with letters rearranged gives 'enomy'.
'co' going into 'enomy' is 'ECONOMY'.
(Other definitions for economy that I've seen before include "Careful expenditure" , "Judicious expenditure of money" , "Thrifty management of resources" , "Me coy? No! (anag)" , "Financial prudence" .)