Crossword Genius

The garment for many a company head (3)

Ross

I believe the answer is:

mac

'the garment' is the definition.
(mac is a kind of garment)

'many a company head' is the wordplay.
'many' becomes 'm' (**).
'head' suggests taking the first letters.
The first letter of 'company' is 'c'.
'm'+'a'+'c'='MAC'

'for' acts as a link.

(Other definitions for mac that I've seen before include "It may help you keep dry" , "Raincoat (colloq.)" , "Waterproof raincoat, in short" , "Overcoat" , "one used in shower?" .)

I've seen this clue in the Evening Standard.
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