Boast wildly about one Smollett (6)
I believe the answer is:
tobias
'smollett' is the definition.
(poet Tobias Smollett is an example)
'boast wildly about one' is the wordplay.
'wildly' indicates an anagram.
'about' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'boast' with letters rearranged gives 'tobas'.
'tobas' going around 'i' is 'TOBIAS'.
(Other definitions for tobias that I've seen before include "Boy" , "Biblical man" , "-- Smollett, novelist" .)