Scramble up mountain track, perhaps (11,4)
I believe the answer is:
punctuation mark
'scramble' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'up mountain track perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'up'+'mountain'+'track'='upmountaintrack'
'upmountaintrack' anagrammed gives 'PUNCTUATION MARK'.
Can you help me to learn more?
(Other definitions for punctuation mark that I've seen before include "Possibly stop" , "period in US, say" , "period in New York, perhaps? - with 5d" .)