Consider change for the better, inspired by spouse (8)
I believe the answer is:
meditate
'consider' is the definition.
(I've seen this before)
'change for the better inspired by spouse' is the wordplay.
'change for the better' becomes 'edit' (to edit something is to change it).
'inspired by' indicates putting letters inside (some letters breathed in or 'inspired' by others).
'spouse' becomes 'mate' (synonyms).
'edit' going inside 'mate' is 'MEDITATE'.
(Other definitions for meditate that I've seen before include "Ponder" , "Think contemplatively" , "Focus one's mind for a period for spirituality or relaxation" , "Consider thoughtfully" , "Reflect upon" .)