Buzz brought about by short time in farm (6)
I believe the answer is:
thrill
'buzz' is the definition.
(I've seen this before)
'short time in farm' is the wordplay.
'short time' becomes 'hr' (short for hour).
'in' indicates putting letters inside.
'farm' becomes 'till' (to till is to work on land).
'hr' placed inside 'till' is 'THRILL'.
'brought about by' is the link.
(Other definitions for thrill that I've seen before include "Exciting sensation, wave of feeling" , "Titillate" , "bring a tingle of excitement" , "D. W. _, pioneer US film director; rigs fifth (anag.)" , "Excited sensation" .)