Flashy, singular, eccentric, zany, Zimbabwean leader (6)
I believe the answer is:
snazzy
'flashy' is the definition.
(synonyms)
'singular eccentric zany zimbabwean leader' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'eccentric' indicates an anagram.
'leader' indicates taking the first letters.
The initial letter of 'zimbabwean' is 'z'.
'zany'+'z'='zanyz'
'zanyz' with letters rearranged gives 'nazzy'.
's'+'nazzy'='SNAZZY'
(Other definitions for snazzy that I've seen before include "Smart" , "Stylish (informal)" .)