Dad was first to have looked wan (5)
I believe the answer is:
paled
'have looked wan' is the definition.
I can't judge whether this definition defines the answer.
'dad was first' is the wordplay.
'dad' becomes 'pa' (both can mean one's father).
'was first' becomes 'led' (to lead is to go first).
'pa'+'led'='PALED'
'to' is the link.
Can you help me to learn more?
(Other definitions for paled that I've seen before include "Went white or ashen" , "Went white, lost facial colour" .)