Sketch slippery customer returning to sheltered side (7)
I believe the answer is:
leeward
'sheltered side' is the definition.
(I've seen this before)
'sketch slippery customer returning' is the wordplay.
'sketch' becomes 'draw' (I've seen this before).
'slippery customer' becomes 'eel' (I've seen this in another clue).
'returning' says the letters should be written in reverse.
'draw'+'eel'='draweel'
'draweel' backwards is 'LEEWARD'.
'to' is the link.
(Other definitions for leeward that I've seen before include "Of ship, on side turned away from wind" , "WI island group" , "A welder (anag.)" , "On sice turned away from wind" , "Heading for shelter" .)