Shower, then pour heavily, round about six (6)

I believe the answer is:

lavish

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This clue could be a double definition.

'shower' is the first definition.
(I know that shower can be written as lavish)

'pour heavily round about six' is the second definition.
'lavish' can be an answer for 'pour' (thesaurus). I am not certain of the 'heavily round about six' bit.

'then' acts as a link.

Can you help me to learn more?

(Other definitions for lavish that I've seen before include "Extravagant or excessive" , "Plentiful or munificent" , "Sumptuous" , "Prodigal - unrestrained" , "shower" .)

I've seen this clue in the Evening Standard.

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