River estuary flounders - a source of riches for the nation? (8)
I believe the answer is:
treasury
'a source of riches for the nation?' is the definition.
I can't tell whether this definition defines the answer.
'river estuary flounders' is the wordplay.
'river' becomes 'r' (abbreviation for river).
'flounders' is an anagram indicator (I've seen 'floundering' mean this (letters flounder or move around)).
'r'+'estuary'='restuary'
'restuary' with letters rearranged gives 'TREASURY'.
Can you help me to learn more?
(Other definitions for treasury that I've seen before include "British Department of Finance" , "thesaurus" , "Exchequer - store for valuables" , "The funds of a state" , "Bank" .)