Support the flaky seer (7)
I believe the answer is:
prophet
'seer' is the definition.
(I know that seer can be written as prophet)
'support the flaky' is the wordplay.
'support' becomes 'prop' (prop up can mean to support).
'flaky' indicates anagramming the letters (I've seen this in other clues).
'the' anagrammed gives 'het'.
'prop'+'het'='PROPHET'
(Other definitions for prophet that I've seen before include "Visionary" , "Prognosticator" , "One who foretells the future as in the Bible" , "One speaks by divine inspiration" , "One who anticipates" .)