Hey, seal mixture created for short hair (7)
I believe the answer is:
eyelash
'hair' is the definition.
(I know that eyelash is a type of hair)
'hey seal mixture' is the wordplay.
'mixture' is an anagram indicator.
'hey'+'seal'='heyseal'
'heyseal' anagrammed gives 'EYELASH'.
'created for short' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for eyelash that I've seen before include "Short facial hair" , "hair near Iris" , "maybe one drops with a wink" , "Hair; cilium (anatomy)" , "Hair by eye" .)