"And ...'s lease hath all too short a date" (Shakespeare sonnet) (6)

I believe the answer is:

summer

(Other definitions for summer that I've seen before include "One adding up" , "See 10" , "could be described as Indian" , "Would one count" , "'Shall I compare thee to a . . . . . .'s day?' (Shakespeare)" .)

I've seen this clue in The Irish Times.

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