Mineral supplement with endless highland spirit (5)
I believe the answer is:
oread
'spirit' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?
'mineral supplement with endless highland' is the wordplay.
'mineral' becomes 'ore' (ore is a kind of mineral).
'supplement with' becomes 'a' (I can't justify this - if you can you should believe this answer much more).
'endless' says to take the centre.
'highland' becomes 'ridge' (I've seen this before).
The central letter of 'ridge' is 'd'.
'ore'+'a'+'d'='OREAD'
Can you help me to learn more?
(Other definitions for oread that I've seen before include "mountainous girl" , "being in range?" , "Natural spirit" , "Maid of the Mountains" , "spirit at peak?" .)