Charlie produces a couple of lines about Heather that relates to the office (8)
I believe the answer is:
clerical
'office' is the definition.
(I've seen this before)
'charlie produces a couple of lines about heather' is the wordplay.
'a couple of lines' means two substitutions for 'line'.
'charlie produces' becomes 'c' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'line' becomes 'l'.
'line' becomes 'l'.
'about' means one lot of letters go next to another.
'heather' becomes 'erica' (I've seen this before).
'l' put after 'erica' is 'erical'.
'c'+'l'+'erical'='CLERICAL'
'that relates to the' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for clerical that I've seen before include "To do with office work and priests" , "Like error on paper" , "Like routine office work" , "Administrative" , "Such a life Eliot depicted" .)