Point rest out for racing expert (7)
I believe the answer is:
tipster
'racing expert' is the definition.
'tipster' can be an answer for 'expert' (tipster is a kind of expert). I am not sure about the 'racing' bit.
'point rest out' is the wordplay.
'point' becomes 'tip' (synonyms).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'rest' is an anagram of 'ster'.
'tip'+'ster'='TIPSTER'
'for' is the link.
Can you help me to learn more?
(Other definitions for tipster that I've seen before include "Race predictor" , "Race winner forecaster" , "One providing betting hints" , "Seller of inside information" , "he recommends risky investments" .)