Lido on chart as playing surface (4,5)
I believe the answer is:
pool table
'playing surface' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'lido on chart' is the wordplay.
'lido' becomes 'pool' (I've seen this before).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'chart' becomes 'table' (a table of information).
'pool'+'table'='POOL TABLE'
'as' is the link.
Can you help me to learn more?
(Other definitions for pool table that I've seen before include "Boot lapel (anag.)" , "pub facility, perhaps" , "Baize-covered feature of many pubs" .)