Two men are standard (6)

I believe the answer is:

normal

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'are standard' is the definition.
(associated in meaning)

'two men' is the wordplay.
'two men' means two replacements for 'man'.
'man' becomes 'norm' (I am not sure about this - if you are sure you should believe this answer much more).
'man' becomes 'Al' (man's name).
'norm'+'al'='NORMAL'

Can you help me to learn more?

(Other definitions for normal that I've seen before include "Accustomed" , "Standard, expected" , "Commonplace" , "Ordinary, not extraordinary" , "'Usual, standard (6)'" .)

I've seen this clue in the Evening Standard.

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