He got a different purpose for lodge (9)
I believe the answer is:
gatehouse
'lodge' is the definition.
(thesaurus)
'he got a different purpose' is the wordplay.
'different' indicates an anagram.
'purpose' becomes 'use' ('use' can be a synonym of 'purpose').
'he'+'got'+'a'='hegota'
'hegota' with letters rearranged gives 'gateho'.
'gateho'+'use'='GATEHOUSE'
'for' is the link.
(Other definitions for gatehouse that I've seen before include "It guards entry to an estate" , "Building by entrance" , "underneath Barbican" , "porter's place?" , "Lodge" .)