Continue to subscribe (5)
I believe the answer is:
renew
'continue to subscribe' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for renew that I've seen before include "Invigorate" , "Restore, resume" , "Update library book, acquaintance, etc" , "Restore - recommence" , "Extend loan period" .)