Rent, with advance sale collapsing on beginning of exchange (8)
I believe the answer is:
sublease
'rent' is the definition.
(I've seen this before)
'advance sale collapsing on beginning of exchange' is the wordplay.
'advance' becomes 'sub' (I've seen this in other clues**).
'collapsing' indicates anagramming the letters.
'on' indicates putting letters inside (as in clothing \'on\' a person).
'beginning of' indicates taking the first letters.
The initial letter of 'exchange' is 'e'.
'sale' is an anagram of 'leas'.
'sub' put inside 'leas' is 'subleas'.
'subleas'+'e'='SUBLEASE'
'with' acts as a link.
(Another definition for sublease that I've seen is " Rent".)