Should it come to pass, will accept the position (4,5)
I believe the answer is:
take place
'should it come to pass' is the definition.
I can't tell whether this defines the answer.
'will accept the position' is the wordplay.
'will' says to put letters next to each other (I've seen this in other clues).
'accept' becomes 'take' (to accept is to take possession of).
'the position' becomes 'place' (place is a kind of position).
'take'+'place' is 'TAKE PLACE'.
Can you help me to learn more?
(Other definitions for take place that I've seen before include "Talk peace (anag) - happen" , "Occur, happen - assume position" .)