As usual, king enjoying Cambs town's amenities? (9)

I believe the answer is:
routinely
'enjoying cambs town's amenities?' is the definition.
I can't tell whether this defines the answer.
'as usual king' is the wordplay.
'as usual' becomes 'routine' (I've seen this before).
'king' becomes 'ly' (I can't explain this - if you can you should believe this answer much more).
'routine'+'ly'='ROUTINELY'
Can you help me to learn more?
(Other definitions for routinely that I've seen before include "according to custom" , "typical fashion" , "As a matter of course" .)
