Take off rider's seat accepting tips from keen equestrian daughter (9)
I believe the answer is:
skedaddle
'take off' is the definition.
(I've seen this in another clue)
'rider's seat accepting tips from keen equestrian daughter' is the wordplay.
'rider's seat' becomes 'saddle' (I've seen this before).
'accepting' indicates putting letters inside (inserted letters are accepted).
'tips from' suggests taking the first letters (letters on tips of the word).
The initial letters of 'keen equestrian daughter' is 'ked'.
'saddle' enclosing 'ked' is 'SKEDADDLE'.
(Other definitions for skedaddle that I've seen before include "Hightail it" , "Vamoose" , "Run off hurriedly (colloq.)" , "Depart hurriedly" , "Get out of town!" .)