Unhappy getting led off to seat (6)
I believe the answer is:
saddle
'seat' is the definition.
(saddle is a kind of seat)
'unhappy getting led off' is the wordplay.
'unhappy' becomes 'sad' ('sad' can be a synonym of 'unhappy'**).
'getting' says to put letters next to each other.
'off' is an anagram indicator.
'led' anagrammed gives 'dle'.
'sad'+'dle'='SADDLE'
'to' is the link.
(Other definitions for saddle that I've seen before include "Impose a task on -- assign responsibility for" , "Seat on horse, bicycle etc" , "Cut of meat" , "land" , "Chafed by riding" .)