Scatter seed in my imagination (5,3)
I believe the answer is:
minds eye
'imagination' is the definition.
(mind's eye is a kind of imagination)
'scatter seed in my' is the wordplay.
'scatter' indicates an anagram.
'seed'+'in'+'my'='seedinmy'
'seedinmy' with letters rearranged gives 'MINDS EYE'.
(Other definitions for minds eye that I've seen before include "The faculty of imagination" , "memory's required" , "contemplation" .)