Still figures increase joining factory (8)

I believe the answer is:

waxworks

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'still figures' is the definition.
'waxworks' can be an answer for 'figures' (waxwork figures). I am not certain of the 'still' bit.

'increase joining factory' is the wordplay.
'increase' becomes 'wax' (waxing is a kind of increasing).
'joining' says to put letters next to each other.
'factory' becomes 'works' (eg a steel works).
'wax'+'works'='WAXWORKS'

Can you help me to learn more?

(Other definitions for waxworks that I've seen before include "Exhibition of modelled figures" , "Figures, eg in Warwick Castle" , "Dummies" , "Museum" , "Exhibition of effigies" .)

I've seen this clue in The Guardian.

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