Everything I had put on page is colourless (6)
I believe the answer is:
pallid
'colourless' is the definition.
('pallid' can be similar in meaning to 'colourless')
'everything i had put on page' is the wordplay.
'everything' becomes 'all' (I've seen this before).
'i had' becomes 'id' (I'd).
'put on' means one lot of letters go next to another.
'page' becomes 'p'.
'all'+'id'='allid'
'allid' after 'p' is 'PALLID'.
'is' is the link.
(Other definitions for pallid that I've seen before include "Insipid; lacking colour" , "Colourless, wan" , "Sickly pale" , "Feeble, insipid" , "Pale, insipid" .)