Text summary needs English to be accurate (7)
I believe the answer is:
Here is my best explanation:
'be accurate' is the definition.
('precise' can be a synonym of 'accurate')
'text summary needs english' is the subsidiary indication.
'text summary' becomes 'precis' (I've seen this before).
'needs' says to put letters next to each other.
'english' becomes 'e' (abbreviation).
'to' is the link.
(Other definitions for precise that I've seen before include "Sharply exact", "Highly accurate and sharply exact", "'Exact, accurate (7)'", "Specific", "Detailed, exact", "Recipes (anag.)", "Exact like recipes", "with accuracy", "Express" and "Accurate".)