Sorry to be led, shaking, to a seat (6)
I believe the answer is:
saddle
'to a seat' is the definition.
(saddle is a kind of seat)
'sorry to be led shaking' is the wordplay.
'sorry' becomes 'sad' (similar in meaning).
'to' is a charade indicator (letters next to each other).
'shaking' is an anagram indicator.
'led' is an anagram of 'dle'.
'sad'+'dle'='SADDLE'
(Other definitions for saddle that I've seen before include "piece of lamb?" , "Seat for a horseman" , "A horseman's seat" , "Seat for a rider, horse or bicycle" , "Impose a task on -- assign responsibility for" .)