Old stager removes rats from gatehouse (5)
I believe the answer is:
lodge
'gatehouse' is the definition.
(thesaurus)
'old stager removes rats' is the wordplay.
I cannot really see how this works, but
an anagram of 'old' is 'lod' which is present in the answer.
The remaining letters 'ge' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'from' is the link.
Can you help me to learn more?
(Other definitions for lodge that I've seen before include "Gatehouse - deposit" , "Small house at gates of park or estate" , "Small dwelling, part of estate" , "Small gatehouse" , "abode" .)