Seeing much delight in always blocking editor (5-4)
I believe the answer is:
eagle-eyed
'seeing much' is the definition.
'delight in always blocking editor' is the wordplay.
'delight' becomes 'glee' (I've seen this before**).
'in' is an insertion indicator.
'always' becomes 'aye' (archaic term for 'always').
'blocking' is an insertion indicator.
'editor' becomes 'ed'.
'glee' inserted within 'aye' is 'agleeye'.
'agleeye' going within 'ed' is 'EAGLE-EYED'.
(Other definitions for eagle-eyed that I've seen before include "Visually on the ball" , "Keen-sighted" , "Very watchful with keen vision" , "Keenly observant" , "Keenly-sighted" .)