Letter also featured in comical write-up (8)
I believe the answer is:
landlord
'letter' is the definition.
(I've seen this before)
'also featured in comical write-up' is the wordplay.
'also' becomes 'and' (I've seen this before).
'featured in' is an insertion indicator.
'comical' becomes 'droll' (I've seen this in another clue).
'write up' shows that the letters should be reversed in order.
'droll' reversed gives 'llord'.
'and' placed into 'llord' is 'LANDLORD'.
(Other definitions for landlord that I've seen before include "Mein host" , "He sets and collects the rent" , "One renting out property" , "He lets out building for rent" , "Publican" .)