Crossword Genius

By which to read chart left by a member? (5,4)

Ross

I believe the answer is:

table lamp

'by which to read' is the definition.
(you might use a table lamp when reading)

'chart left by a member?' is the wordplay.
'chart' becomes 'table' (a table of information).
'left by' becomes 'l' (I've seen this in other clues).
'member?' becomes 'MP' (Member of Parliament).
'table'+'l'+'a'+'mp'='TABLE-LAMP'

(Another definition for table lamp that I've seen is " Portable light source".)

I've seen this clue in The Guardian.
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