"Shall I compare thee to a ...'s day?" (Shakespeare) (6)

I believe the answer is:

summer

(Other definitions for summer that I've seen before include "Adder" , "'Now is the winter of our discontent / Made glorious ... by this sun of York' (Richard III)" , "` `Now is the winter of our discontent / Made glorious ... by this sum of York' ' (Richard III)" , "'Shall I compare thee to a . . . . . .'s day?' (Shakespeare)" , "- - time (Gershwin)" .)

I've seen this clue in The Irish Times.

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