Upset, try covering tracks up (7)
I believe the answer is:
disturb
'upset try covering tracks up' is the definition.
I can't judge whether this definition defines the answer.
'upset try covering tracks up' is the wordplay.
'upset try' becomes 'bid' (bid is a kind of try. I am not sure about the 'upset' bit.).
'covering' is an insertion indicator.
'tracks' becomes 'ruts' (rut is a kind of track).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'bid' enclosing 'ruts' is 'brutsid'.
'brutsid' written backwards gives 'DISTURB'.
Can you help me to learn more?
(Other definitions for disturb that I've seen before include "startle" , "Interfere with" , "Upset, confuse" , "Interrupt (sleep)" , "Bother" .)