Like one's hair having set out on a sleigh? (7)
I believe the answer is:
tousled
'like one's hair having' is the definition.
I can't tell whether this definition defines the answer.
'set out on a sleigh?' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'on' is a charade indicator (letters next to each other).
'a sleigh?' becomes 'sled' ('sled' can be a synonym of 'sleigh').
'out' is an anagram of 'tou'.
'tou'+'sled'='TOUSLED'
Can you help me to learn more?
(Other definitions for tousled that I've seen before include "Of hair, untidy and tangled" , "Made hair untidy, being loudest" , "Dishevelled" , "Mussed up" , "In disarray, hair perhaps" .)