Subscriber runs in without a plan? (11)
I believe the answer is:
undersigned
'subscriber' is the definition.
(I've seen this before)
'runs in without a plan?' is the wordplay.
I cannot really see how this works, but
'runs' could be 'r' (cricket abbreviation) and 'r' is present in the answer.
'plan?' could be 'design' ('design' can be a synonym of 'plan') and 'design' is found within the remaining letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for undersigned that I've seen before include "Person authorising this document" , "Subscriber" .)