Conceived; fancied (8)
I believe the answer is:
This clue is a double definition.
'conceived' is the first definition.
(I've seen this before)
'fancied' is the second definition.
(I've seen this in another clue)
(Other definitions for imagined that I've seen before include "Envisaged" , "thought" , "Formed a mental picture" , "Not based on fact, dubious" , "Dreamed" .)