Crossword Genius

English force by castle in attempt (6)

Ross

I believe the answer is:

effort

(Other definitions for effort that I've seen before include "Work - application" , "Hard mental or physical work" , "An exertion of energy" , "'Endeavour, exertion (6)'" , "Exertion - attempt - achievement" .)

I've seen this clue in The Sun.
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