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 Evening Standard, The Telegraph, The Star Tribune, The Mirror, the Newsday, The Independent, The Times, The Guardian and The Sun.

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