Look over soldier with cold reasoning (5)
I believe the answer is:
logic
'reasoning' is the definition.
(thesaurus)
'look over soldier with cold' is the wordplay.
'look' becomes 'lo'.
'over' says to put letters next to each other.
'soldier' becomes 'gi' (government issue or general issue).
'with' says to put letters next to each other.
'cold' becomes 'c' (eg on taps).
'lo'+'gi'+'c'='LOGIC'
(Other definitions for logic that I've seen before include "Sound reasoning" , "Rationale ?" , "using premises" , "Good reason" , "Reasoned argument" .)