Set up again, as you might on an easel? (7)
I believe the answer is:
restart
'you might on an easel?' is the definition.
I can't tell whether this definition defines the answer.
'set up again' is the wordplay.
'set' becomes 'rest' (resting is a kind of setting).
'up again' becomes 'art' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rest'+'art'='RESTART'
'as' is the link.
Can you help me to learn more?
(Other definitions for restart that I've seen before include "Commence again" , "launch again" , "Resume" , "Begin anew" , "begin afresh" .)