Reflect, seeing change in friend (8)
I believe the answer is:
meditate
'reflect' is the definition.
('meditate' can be a synonym of 'reflect')
'change in friend' is the wordplay.
I cannot really understand how this works, but
'change' could be 'edit' (editing is a kind of changing) and 'edit' is present in the answer.
'friend' could be 'mate' (mate is a kind of friend) and 'mate' is found in the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'seeing' acts as a link.
Can you help me to learn more?
(Other definitions for meditate that I've seen before include "Think deeply and quietly" , "Spend time in thought" , "brood" , "Think intently and at length" , "Focus one's mind for a period for spirituality or relaxation" .)