Inarticulate guide to net needs rewriting (6-4)
I believe the answer is:
Here is my best explanation:
'inarticulate' is the definition.
('tongue-tied' can be similar in meaning to 'inarticulate')
'guide to net needs rewriting' is the wordplay.
'needs rewriting' indicates an anagram (I've seen this in other clues).
'guidetonet' anagrammed gives 'TONGUE-TIED'.
(Other definitions for tongue-tied that I've seen before include "(Out of shyness) barely able to speak", "Unable to speak coherently", "Speechless from embarrassment", "Unable to say" and "Speechless with shyness".)