Frowned with displeasure at animal aboard sleigh (7)
I believe the answer is:
scowled
'frowned' is the definition.
(scowling is a kind of frowning)
'animal aboard sleigh' is the wordplay.
'animal' becomes 'cow' (cow is a kind of animal).
'aboard' is an insertion indicator.
'sleigh' becomes 'sled' (synonyms).
'cow' inserted into 'sled' is 'SCOWLED'.
'with displeasure at' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for scowled that I've seen before include "Pulled a face" , "Looked gloomy" .)