Staying power (7)

I believe the answer is:

stamina

(Other definitions for stamina that I've seen before include "Staying-power, endurance" , "energy to go on" , "Ability to maintain effort" , "fortitude" , "perseverance" .)

I've seen this clue in The Telegraph, the Newsday, The Guardian, the Evening Standard, The Independent, The Star Tribune, The Sun, The Mirror and The Times.

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