Alec's fresh mount (5)
I believe the answer is:
scale
'mount' is the definition.
(I know that scale is a type of mount)
'alec's fresh' is the wordplay.
'fresh' is an anagram indicator.
'alecs' anagrammed gives 'SCALE'.
(Other definitions for scale that I've seen before include "Measure" , "Hierarchy" , "Weigh up" , "Group of notes in ascending or descending order" , "Notes < magnitude" .)