Outcome of break taken about the middle of July (6)
I believe the answer is:
'outcome' is the definition.
(I know that outcome can be written as result)
'break taken about the middle of july' is the wordplay.
'break' becomes 'rest' (a rest is taking a break).
'taken about' is an insertion indicator.
'the middle of' means to look at the middle letters.
The middle letters of 'july' are 'ul'.
'rest' going around 'ul' is 'RESULT'.
'of' acts as a link.
(Other definitions for result that I've seen before include "Ulster (anag) - outcome" , "Final outcome" , "Final score" , "End - issue" , "'Outcome, consequence (6)'" .)