It's miles away perhaps from baked beans on top of toast (6)
I believe the answer is:
absent
'it's miles away perhaps' is the definition.
I can't judge whether this definition defines the answer.
'baked beans on top of toast' is the wordplay.
'baked' is an anagram indicator.
'on top of' indicates taking the first letters (I've seen 'on top' mean this).
The initial letter of 'toast' is 't'.
'beans' anagrammed gives 'absen'.
'absen'+'t'='ABSENT'
'from' is the link.
Can you help me to learn more?
(Other definitions for absent that I've seen before include "Forgetful, with mind on other things" , "Away" , "Not present or focused" , "Inattentive" , "nowhere to be seen" .)