A fast time in boat race Oxford finally accomplished (8)
I believe the answer is:
talented
'accomplished' is the definition.
(thesaurus)
'a fast time in boat race oxford finally' is the wordplay.
'fast time' becomes 'lent' (I've seen this before).
'in' means one lot of letters goes inside another.
'finally' says to take the final letters.
The final letters of 'boat race oxford' are 'ted'.
'a'+'lent'='alent'
'alent' placed inside 'ted' is 'TALENTED'.
(Other definitions for talented that I've seen before include "Skilful" , "Possessing ability" , "Endowed with gifts" , "Clever" , "Possessing aptitude" .)