Joint head of kindergarten born in Paris (4)
I believe the answer is:
knee
'joint' is the definition.
(knee is a kind of joint)
'head of kindergarten born in paris' is the wordplay.
'head of' suggests taking the first letters.
'born in paris' becomes 'nee' (I've seen this before).
The first letter of 'kindergarten' is 'k'.
'k'+'nee'='KNEE'
(Other definitions for knee that I've seen before include "Joint of the body" , "Human joint" , "Major joint in leg" , "Technical name for this joint is genu" , "Wounded in Indian Wars action" .)