Pole who somehow fell head over heels in sales area (8)
I believe the answer is:
showroom
'sales area' is the definition.
(I've seen this before)
'pole who somehow fell head over heels' is the wordplay.
'pole' becomes 's' (abbreviation for South, as in South Pole).
'somehow' indicates anagramming the letters.
'fell' becomes 'moor' (both can mean an expanse of wild land).
'head over heels' says the letters should be written backwards (in a down clue, letters flip upside down).
'moor' written backwards gives 'room'.
'who' is an anagram of 'how'.
's'+'how'+'room'='SHOWROOM'
'in' is the link.
(Other definitions for showroom that I've seen before include "Scene for displaying" , "Area for the display of merchandise" , "sales area" , "Shop display area" , "Semi-transparent" .)