Burden on farmers originally facing bad weather (7)
I believe the answer is:
refrain
'burden' is the definition.
(I've seen this before)
'on farmers originally facing bad weather' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'originally' says to take the initial letters.
'facing' means one lot of letters go next to another.
'bad weather' becomes 'rain' (rain is an example of bad weather).
The first letter of 'farmers' is 'f'.
're'+'f'+'rain'='REFRAIN'
(Other definitions for refrain that I've seen before include "Much repeated saying" , "Forbear from chorus?" , "Chorus; desist" , "Words repeated after verses" , "Hold back" .)