Sketch rear of wagon pulled along (5)
I believe the answer is:
drawn
'pulled along' is the definition.
('draw' can be a synonym of 'pull along')
'sketch rear of wagon' is the wordplay.
'sketch' becomes 'draw' (I've seen this before).
'rear of' indicates one should take the final letters.
The last letter of 'wagon' is 'n'.
'draw'+'n'='DRAWN'
(Other definitions for drawn that I've seen before include "showing some tension" , "stressed" , "being put in the picture?" , "tense" , "Looking strained, sketched" .)