One bears them in mind, of course (8)
I believe the answer is:
thoughts
'mind of course' is the definition.
'thoughts' can be an answer for 'mind' (thesaurus). I'm not sure about the 'of course' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for thoughts that I've seen before include "Ideas, reflections" , "Cogitations" , "Ideas and opinions (8)" , "Ideas, musings" , "Notions" .)