Please! Outside and ask about the highest points (5)
I believe the answer is:
peaks
'the highest points' is the definition.
(I've seen this before)
'please outside and ask about' is the wordplay.
'outside' suggests removing the centre.
'and' means one lot of letters go next to another.
'about' indicates anagramming the letters.
'please' with its centre removed is 'pe'.
'ask' is an anagram of 'aks'.
'pe'+'aks'='PEAKS'
(Other definitions for peaks that I've seen before include "Highest points" , "Mountain tops" , "Culminates" .)