Honour royal at centre and follow rules (4)
I believe the answer is:
obey
'follow rules' is the definition.
(I've seen this in another clue)
'honour royal at centre' is the wordplay.
'honour' becomes 'obe' (Order of the British Empire award).
'at centre' means to look at the middle letters.
The middle letter of 'royal' is 'y'.
'obe'+'y'='OBEY'
'and' is the link.
(Other definitions for obey that I've seen before include "Accept instructions" , "Follow orders" , "Do what one is told" , "Submit to authority" , "Heed" .)