Clown, eccentric person, target at fair? (7)
I believe the answer is:
coconut
'target at fair?' is the definition.
(as in a coconut shy)
'clown eccentric person' is the wordplay.
'clown' becomes 'coco' (Nicolai Poliakoff aka Coco the Clown).
'eccentric person' becomes 'nut' (nut is a kind of eccentric person).
'coco'+'nut'='COCONUT'
(Other definitions for coconut that I've seen before include "Oval nut with fibrous husk" , "cut from the palm?" , "Palm tree product" , "Large palm seed" , "fair target" .)