Rainy time in month happening shortly (7)

I believe the answer is:

monsoon

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'rainy time' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'month happening shortly' is the wordplay.
'month' becomes 'M' (standard abbreviation).
'happening' becomes 'on'.
'shortly' becomes 'soon' (synonyms).
'm'+'on'+'soon'='MONSOON'

'in' is the link.

Can you help me to learn more?

(Other definitions for monsoon that I've seen before include "Rainy period" , "Seasonal Indian Ocean wind" , "Seasonal wind or rainy season in S Asia" , "Seasonal Asian wind" , "Very heavy rainfall season" .)

I've seen this clue in The Sun.

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