As worn by master Charlie? (3)

I believe the answer is:

mac

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'as worn by master charlie?' is the definition.
The definition suggests a singular noun which matches the answer.

'by master charlie?' is the wordplay.
'by' means one lot of letters go next to another.
'master' becomes 'ma' (Master of Arts).
'charlie?' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'ma'+'c' is 'MAC'.

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(Other definitions for mac that I've seen before include "PC" , "A Gaelic son, often in name" , "Waterproof coat (colloq.)" , "A rainproof" , "Raincoat (colloq.)" .)

I've seen this clue in the Evening Standard.

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