Unrecognisable figures try Guinness I brewed with me (3,2,4,5)

I believe the answer is:

men in grey suits

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'unrecognisable figures' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'try guinness i brewed with me' is the wordplay.
'brewed with' indicates anagramming the letters.
'try'+'guinness'+'i'='tryguinnessi'
'tryguinnessi' with its letters mixed up with 'me' gives 'MEN IN GREY SUITS'.

Can you help me to learn more?

(Other definitions for men in grey suits that I've seen before include "Civil servants" , "Power brokers" .)

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