Cereal crop parts burning in distance we hear? (7)
I believe the answer is:
earshot
'distance we hear?' is the definition.
(range of hearing)
'cereal crop parts burning' is the wordplay.
'cereal crop parts' becomes 'ears' (as in ears of corn).
'burning' becomes 'hot' (similar in meaning).
'ears'+'hot'='EARSHOT'
'in' acts as a link.
(Other definitions for earshot that I've seen before include "Extent of being heard" , "To share (anag)" , "catching distance?" , "Hearing distance" , "Within which we hear" .)