Increase labour of one in Tussaud's (7)
I believe the answer is:
waxwork
'one in tussaud's' is the definition.
I know that 'tussaud's' relates to this answer.
'increase labour' is the wordplay.
'increase' becomes 'wax' (waxing is a kind of increasing).
'labour' becomes 'work' (I've seen this before).
'wax'+'work'='WAXWORK'
'of' is the link.
Can you help me to learn more?
(Other definitions for waxwork that I've seen before include "Still representation of a famous person" , "Image" , "Figure made from candle material" , "Life-sized representation of a celebrity" , "Candle material effigy" .)