Text summary needs English to be accurate (7)
I believe the answer is:
precise
'accurate' is the definition.
('precise' can be similar in meaning to 'accurate')
'text summary needs english' is the wordplay.
'text summary' becomes 'precis' (I've seen this before).
'needs' is a charade indicator (letters next to each other).
'english' becomes 'e' (abbreviation).
'precis'+'e'='PRECISE'
'to be' acts as a link.
(Other definitions for precise that I've seen before include "Highly accurate and sharply exact" , "Detailed, exact" , "'Exact, accurate (7)'" , "Express" , "Exact like recipes" .)