Crossword Genius

Shrewd to use last substitute as player. (6)

Ross

I believe the answer is:

astute

(Other definitions for astute that I've seen before include "Shrewd, canny" , "Shrewd, wily" , "Sharp and clever" , "smart (with some self-interest?)" , "Able to assess (people or situations) accurately" .)

I've seen this clue in The Irish Times.
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