Small bird of prey among a number where, any higher, it's white (8)
I believe the answer is:
snowline
'any higher it's white' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'small bird of prey among a number' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'bird of prey' becomes 'owl' (owl is a kind of bird of prey).
'among' is an insertion indicator.
'a number' becomes 'nine' (nine is a kind of number).
'owl' placed inside 'nine' is 'nowline'.
's'+'nowline'='SNOWLINE'
'where' is the link.
Can you help me to learn more?
(Other definitions for snowline that I've seen before include "feature of mountain" , "over which it's always white" .)