The range, maybe, is very extensive, we hear (5)
I believe the answer is:
grate
'the range maybe is very' is the definition.
I can't judge whether this definition defines the answer.
'extensive we hear' is the wordplay.
'extensive' becomes 'great' (I've seen this in another clue).
'we hear' shows a homophone (sound like).
'great' sounds like 'GRATE'.
Can you help me to learn more?
(Other definitions for grate that I've seen before include "Firebasket" , "Jar; fireplace" , "Shred - jar" , "in which Santa lands?" , "Rasp; shred" .)