Like a rainy day in Soweto (3)

I believe the answer is:

wet

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

'like a rainy day' is the definition.
I can't tell whether this definition defines the answer.

'in soweto' is the wordplay.
'in' indicates the answer is hidden within the clue.
'WET' can be found hidden inside 'soweto'.

Can you help me to learn more?

(Other definitions for wet that I've seen before include "Irresolute" , "Moistened" , "Saturated with liquid" , "Damp" , "Moisture; feeble (colloq.)" .)

I've seen this clue in the Evening Standard.

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