Attempted to replant seed, say (7)
I believe the answer is:
essayed
'attempted' is the definition.
('essay' can be a synonym of 'attempt')
'replant seed say' is the wordplay.
'replant' indicates an anagram (I've seen this in other clues).
'seed'+'say'='seedsay'
'seedsay' is an anagram of 'ESSAYED'.
'to' acts as a link.
(Other definitions for essayed that I've seen before include "Tried (E, not A)" , "Attempted, endeavoured" , "Made formal attempt" , "Attempted, tried" , "tested" .)