No right to begin to copy (4)
I believe the answer is:
stat
'to copy' is the definition.
(I've seen this before)
'no right to begin' is the wordplay.
'no right' becomes 'sta' (I can't explain this - if you can you should give a lot more credence to this answer).
'begin' says to take the initial letters.
The initial letter of 'to' is 't'.
'sta'+'t'='STAT'
Can you help me to learn more?
(Other definitions for stat that I've seen before include "Doctor's immediately" , "Might it control warmth" , "copy" , "accepted numerical fact" , "Photocopy" .)