Sketch showing Dean and Lee with it in ruins (9)
I believe the answer is:
delineate
'sketch' is the definition.
(I've seen this before)
'dean and lee with it in ruins' is the wordplay.
'and' says to put letters next to each other (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'in ruins' indicates an anagram.
'lee' after 'it' is 'itlee'.
'dean' put after 'itlee' is 'itleedean'.
'itleedean' is an anagram of 'DELINEATE'.
'showing' is the link.
(Other definitions for delineate that I've seen before include "Precisely describe" , "Indicate precisely" , "Outline" , "Draw" , "Portray precisely - teen ideal (anag)" .)