Rubbery source for slow times (5)

I believe the answer is:

latex

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'rubbery source' is the definition.
'latex' can be an answer for 'source' (I have seen 'Source of rubber ' mean 'latex' so perhaps 'source' could also mean 'latex'). I'm not certain of the 'rubbery' bit.

'slow times' is the wordplay.
'slow' becomes 'late' (I've seen this in other clues).
'times' becomes 'x' (multiplication sign).
'late'+'x'='LATEX'

'for' is the link.

Can you help me to learn more?

(Other definitions for latex that I've seen before include "Rubber solution" , "Exalt (anag)" , "Milky fluid produced by plants" , "white stuff" , "Liquid used in making rubber" .)

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

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