When barrister rises to speak, it's logical! (6,2,6)
I believe the answer is:
stands to reason
'logical' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'when barrister rises to speak it's' is the wordplay.
I cannot really see how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is located in the answer.
'to' is within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stands to reason that I've seen before include "What a barrister does" , "obvious" .)