Wise-looking old learner included in list in the past (6)
I believe the answer is:
owlish
'wise-looking' is the definition.
(I've seen this in another clue)
'old learner included in list in the past' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'included in' is an insertion indicator.
'list in the past' becomes 'wish' (I can't explain this - if you can you should believe this answer much more).
'l' placed into 'wish' is 'wlish'.
'o'+'wlish'='OWLISH'
Can you help me to learn more?
(Other definitions for owlish that I've seen before include "Solemn, wise; like a bird" , "Having appearance like wise old bird" , "solemn and wise in appearance?" .)