Expert supports outrageous risk in competition (3,4)

'competition' is the definition.
(ski race is a kind of competition)

'expert supports outrageous risk' is the wordplay.
'expert' becomes 'ace' (ace can informally mean very good).
'supports' is a charade indicator (letters next to each other) (bottom letters provide a support for the top ones).
'outrageous' indicates anagramming the letters (an outrageous spelling).
'risk' anagrammed gives 'skir'.
'ace' after 'skir' is 'SKI RACE'.

'in' is the link.