Correct English book, appreciated all round (5)
I believe the answer is:
debug
'correct' is the definition.
(debugging is a kind of correcting)
'english book appreciated all round' is the wordplay.
'english' becomes 'E' (abbreviation).
'book' becomes 'b' (abbreviation for book).
'appreciated' becomes 'dug' (to dig something is to appreciate or like it).
'all round' indicates putting letters inside.
'e'+'b'='eb'
'eb' placed inside 'dug' is 'DEBUG'.
(Other definitions for debug that I've seen before include "correct code?" , "Revise programme" , "Refrain (from)" , "Remove error from computer program" , "put things right" .)