A record peak (3)
I believe the answer is:
alp
'peak' is the definition.
(I've seen this in another clue)
'a record' is the wordplay.
'record' becomes 'L-P' (abbreviation for long play record).
'a'+'lp'='ALP'
(Other definitions for alp that I've seen before include "high point" , "High mountain" , "One of a European mountain range" , "Mountain pasture" , "Mont Blanc, for example" .)