Topics? The writer is engaged in most of the current ones (6)
I believe the answer is:
themes
'topics?' is the definition.
('theme' can be a synonym of 'topic')
'writer is engaged in most of the current ones' is the wordplay.
'writer' becomes 'me' (the person who wrote the clues).
'is engaged in' indicates putting letters inside.
'most of' means to remove the last letter.
'current ones' becomes 'es' (I can't justify this - if you can you should give a lot more credence to this answer).
'the' with its final letter taken away is 'th'.
'th'+'es'='thes'
'me' put inside 'thes' is 'THEMES'.
'the' is the link.
Can you help me to learn more?
(Other definitions for themes that I've seen before include "Subjects or unifying ideas" , "Subject matters, motifs" , "Recurrent ideas" , "'Subjects, topics (6)'" , "Topics, ideas, motifs" .)