Endlessly courageous going over a Spanish Costa (5)
I believe the answer is:
brava
'spanish costa' is the definition.
(I've seen this before)
'endlessly courageous going over a' is the wordplay.
'endlessly' means to remove the last letter.
'courageous' becomes 'brave' ('brave' can be a synonym of 'courageous').
'going over' says to put letters next to each other.
'brave' with its last letter taken away is 'brav'.
'brav'+'a'='BRAVA'
(Other definitions for brava that I've seen before include "Approving cry (to diva)" , "See 17" , "Well done!" , "1 across - - , Sp. coastal region" , "Spanish Costa" .)