A drop in rent (4)

I believe the answer is:

tear

I believe this clue is a double definition.

'a drop' is the first definition.
(thesaurus)

'rent' is the second definition.
('tear' can be a synonym of 'rent')

'in' is the link.

(Other definitions for tear that I've seen before include "A drop of sadness" , "A drop of optical moisture" , "Rip, pull apart" , "Lachrymal drop - rip" , "Rip - eye moisture" .)

I've seen this clue in The Telegraph and The Globe and Mail.

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