Type of exercise developed around Haiti (3,3)
I believe the answer is:
tai chi
'type of exercise' is the definition.
'tai chi' can be an answer for 'exercise' (I've seen this before). I'm unsure of the 'type of' bit.
'developed around haiti' is the wordplay.
'developed' indicates an anagram.
'around' becomes 'c' (abbreviation for 'circa').
'c'+'haiti'='chaiti'
'chaiti' is an anagram of 'TAI CHI'.
Can you help me to learn more?
(Other definitions for tai chi that I've seen before include "'Chinese meditation involving slow physical exercise (3,3)'" , "form of self-defence" , "Chinese martial art and system of callisthenics" , "Chinese exercises" , "'Chinese form of slow physical exercise (3,3)'" .)