Racer frantic in sailing dinghy for bird repellent (9)
I believe the answer is:
scarecrow
'bird repellent' is the definition.
(a scarecrow repels crows)
'racer frantic in sailing dinghy' is the wordplay.
'frantic' is an anagram indicator.
'in' indicates putting letters inside.
'sailing dinghy' becomes 'scow' (type of dinghy).
'racer' is an anagram of 'arecr'.
'arecr' inserted inside 'scow' is 'SCARECROW'.
'for' is the link.
(Other definitions for scarecrow that I've seen before include "Figure to frighten away birds" , "he's shabbily dressed" , "One in 5d's party" , "6 [FRIEND OF DOROTHY]" , "Stuffed shirt for frightening birds" .)