Crossword Genius

Usually at home - army officer (2,7)

Ross

I believe the answer is:

in general

'usually' is the definition.
(thesaurus)

'home army officer' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'army officer' becomes 'general' (I've seen this before).
'in'+'general'='IN GENERAL'

'at' is the link.

(Other definitions for in general that I've seen before include "Largely" , "Not particularly" , "Where soldiers should have faith" , "for the most part" , "More-or-less" .)

I've seen this clue in The Telegraph.
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