Turning up as well, fool consumes starter of beef Wellington (7)
I believe the answer is:
gumboot
'wellington' is the definition.
(I've seen this before)
'turning up as well fool consumes starter of beef' is the wordplay.
'turning up' says the letters should be written backwards.
'as well' becomes 'too' (both can mean 'also').
'fool' becomes 'mug' (synonyms).
'consumes' is an insertion indicator.
'starter of' says to take the initial letters.
The initial letter of 'beef' is 'b'.
'too'+'mug'='toomug'
'toomug' going around 'b' is 'toobmug'.
'toobmug' backwards is 'GUMBOOT'.
(Other definitions for gumboot that I've seen before include "Wader" , "Wellington" , "Waterproof footwear" .)