Entirely at home, small child given love (2,4)
I believe the answer is:
in toto
'entirely' is the definition.
(thesaurus)
'home small child given love' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'small child' becomes 'tot' (I've seen this before).
'given' means one lot of letters go next to another.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'in'+'tot'+'o'='IN TOTO'
'at' is the link.
(Other definitions for in toto that I've seen before include "Altogether, completely" , "As a whole (Latin)" , "As a whole (Lat.)" , "overall" , "In entirety" .)