He waded, foolishly, right in (6)
I believe the answer is:
edward
'he' is the definition.
(I've seen this before)
'waded foolishly right in' is the wordplay.
'foolishly' is an anagram indicator.
'right' becomes 'r' (common abbreviation).
'in' means one lot of letters goes inside another.
'waded' with letters rearranged gives 'edwad'.
'edwad' going around 'r' is 'EDWARD'.
(Other definitions for edward that I've seen before include "Name of eight kings" , "Fellow" , "Name Lambert Simnel took when crowned" , "The Black Prince" , "-- Heath, British PM" .)