Wind resistance in middle of Channel different (7)
I believe the answer is:
norther
'wind' is the definition.
(norther is a kind of wind)
'resistance in middle of channel different' is the wordplay.
'resistance' becomes 'r' (electronics abbreviation).
'in' is an insertion indicator.
'middle of' says to take the centre.
'different' becomes 'other' (similar in meaning).
The middle of 'channel' is 'n'.
'n'+'other'='nother'
'r' inserted within 'nother' is 'NORTHER'.
(Other definitions for norther that I've seen before include "Storm" , "Winter gale" .)