On return, is not revising one's ideas (7)
I believe the answer is:
notions
'one's ideas' is the definition.
'notions' can be an answer for 'ideas' (notion is a kind of idea). I'm not certain of the 'one's' bit.
'on return is not revising' is the wordplay.
'return' shows that the letters should be reversed in order.
'revising' is an anagram indicator.
'on' backwards is 'no'.
'is'+'not'='isnot'
'isnot' is an anagram of 'tions'.
'no'+'tions'='NOTIONS'
Can you help me to learn more?
(Other definitions for notions that I've seen before include "Fanciful or capricious ideas" , "Whims, ideas or small personal articles" , "Fanciful feelings" , "Vague ideas" , "Thoughts" .)