Select a method to subtract (4,4)
I believe the answer is:
take away
'subtract' is the definition.
(I've seen this before)
'select a method' is the wordplay.
'select' becomes 'take' (synonyms).
'method' becomes 'way' (way of doing something).
'take'+'a'+'way'='TAKE-AWAY'
'to' is the link.
(Other definitions for take away that I've seen before include "Subtract - fast food" , "Minus" , "Remove - portable food" , "Remove - portable meals" .)