Crossword Genius

Some months, he reckons (6)

Ross

I believe the answer is:

summer

I'm a little stuck... Click here to teach me more about this clue!

'some' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?

'months he reckons' is the wordplay.
I cannot quite understand how this works, but
'months' could be 'm' and 'm' is found in the answer.
The remaining letters 'sumer' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for summer that I've seen before include "Mathematician" , "` `Now is the winter of our discontent / Made glorious ... by this sum of York' ' (Richard III)" , "Beam" , "'. . . . . . time an' the livin' is easy' (song)" , "Adder" .)

I've seen this clue in the Evening Standard.
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