Overexert in heaviest rainfall (6)

I believe the answer is:

strain

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

'in heaviest rainfall' is the wordplay.
'in' indicates a hidden word.
'STRAIN' can be found hidden inside 'heaviest rainfall'.

(Other definitions for strain that I've seen before include "Injure (a muscle); distinct breed" , "Sieve; breed" , "Family; effort" , "Melody; filter" , "Pressure - filter" .)

I've seen this clue in the Sydney Morning Herald.

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