Crossword Genius

Daily, Charlie gets thinner (7)

Ross

I believe the answer is:

cleaner

'daily' is the definition.
(dated term for a woman cleaner)

'charlie gets thinner' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'gets' means one lot of letters go next to another.
'thinner' becomes 'leaner' ('lean' is associated in meaning with 'thin').
'c'+'leaner'='CLEANER'

(Other definitions for cleaner that I've seen before include "Eg, launderer, duster" , "Char; detergent" , "Charwoman - vacuum" , "Maybe Daily" , "More sanitary" .)

I've seen this clue in The Guardian.
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