A true Damascene conversion holding mass in leisure centre (9,6)

I believe the answer is:

amusement arcade

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'leisure centre' is the definition.
The definition suggests a singular noun which matches the answer.

'a true damascene conversion holding mass' is the wordplay.
'conversion' indicates an anagram.
'holding' means one lot of letters goes inside another.
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'a'+'true'+'damascene'='atruedamascene'
'atruedamascene' with letters rearranged gives 'amuseentarcade'.
'amuseentarcade' enclosing 'm' is 'AMUSEMENT ARCADE'.

'in' is the link.

Can you help me to learn more?

(Other definitions for amusement arcade that I've seen before include "kids might have fun here" , "Where to find games machines" , "gambling joint" , "gambling haunt" .)

I've seen this clue in The Times.

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