Crossword Genius

Long time to wait for June's ice cream, might you say? (1,5,2,7)

Ross

I believe the answer is:

a month of sundays

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'long time' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for a month of sundays that I've seen before include "a long time" , "lots of services?" , "A bit of a stretch" , "for ages" .)

I've seen this clue in The Telegraph.
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