Wholly at home, child given love (2,4)
I believe the answer is:
in toto
'wholly' is the definition.
(I've seen this before)
'home child given love' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'child' becomes 'tot' (term for a young child).
'given' says to put letters next to each other.
'love' becomes 'o' (love means zero in tennis).
'in'+'tot'+'o'='IN TOTO'
'at' is the link.
(Other definitions for in toto that I've seen before include "Altogether, completely" , "Completely - entirely (Latin)" , "As a whole (Latin)" , "Wholly" , "All told" .)