Bring up idea timeshare arrangement will make this digression (11)
I believe the answer is:
parenthesis
'this digression' is the definition.
(synonyms)
'bring up idea timeshare arrangement' is the wordplay.
I cannot quite understand how this works, but
'bring up' could be 'parent' (synonyms) and 'parent' is present in the answer.
This explanation may well be incorrect...
'will make' acts as a link.
Can you help me to learn more?
(Other definitions for parenthesis that I've seen before include "Extra words" , "something added in text" , "that immediately follows this" , "interval" , "Something in brackets" .)