A channel it's difficult to get right into (6)
I believe the answer is:
trough
'a channel' is the definition.
(I know that trough is a type of channel)
'difficult to get right into' is the wordplay.
'difficult' becomes 'tough' (similar in meaning).
'to get right' becomes 'r' (I've seen this in other clues).
'into' means one lot of letters goes inside another.
'tough' going around 'r' is 'TROUGH'.
'it's' acts as a link.
(Other definitions for trough that I've seen before include "Long container for animal feed" , "Container for watering or feeding animals" , "Depression - animal food holder" , "Feed manger" , "Gutter; depression" .)