Fruit fair's conspicuous position (9)
I believe the answer is:
limelight
'conspicuous position' is the definition.
'fruit fair's' is the wordplay.
'fruit' becomes 'lime' (lime is a kind of fruit).
'fair' becomes 'light' (I've seen this before).
'lime'+'light'='LIMELIGHT'
(Other definitions for limelight that I've seen before include "A theatrical glower" , "having prominence on stage" , "(In the) public eye" , "centre of public attention" , "Focus of attention" .)