Place with malaria and other infestation (6)
I believe the answer is:
plague
'other infestation' is the definition.
'plague' can be an answer for 'infestation' (I've seen this before). I'm unsure of the 'other' bit.
'place with malaria' is the wordplay.
'place' becomes 'pl' (abbreviation used in postal addresses).
'with' means one lot of letters go next to another.
'malaria' becomes 'ague' (synonyms).
'pl'+'ague'='PLAGUE'
'and' is the link.
Can you help me to learn more?
(Other definitions for plague that I've seen before include "Destructive, highly contagious disease" , "Annoy continually" , "Pestilential epidemic" , "Large-scale illness" , "fatal outbreak" .)