Peels off shapeless type of window (4)
I believe the answer is:
sash
'window' is the definition.
(I've seen this before)
'peels off shapeless type' is the wordplay.
'off' indicates named letters should be taken away (some letters taken off).
'type' is an anagram indicator.
'shapeless' with 'peels' taken away is 'hass'.
'hass' with letters rearranged gives 'SASH'.
'of' is the link.
(Other definitions for sash that I've seen before include "Frame for a windowpane" , "Decorative belt" , "Baldrick" , "Popular band in Northern Ireland" , "Cummerbund" .)