Conform with honour on May 3 (4)

I believe the answer is:

obey

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'conform with' is the definition.
(I've seen this before)

'honour on may 3' is the wordplay.
'honour' becomes 'obe'.
'on may 3' becomes 'y' (I am not sure about this - if you are sure you should believe this answer much more).
'obe'+'y'='OBEY'

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(Other definitions for obey that I've seen before include "Submit to authority" , "Carry out (a command)" , "Be dominated" , "Be ruled by" , "Perversely inclined to do the opposite" .)

I've seen this clue in the Evening Standard.

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