Daily, Charlie gets thinner (7)
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" .)