The spread includes one ham? (8)
I believe the answer is:
thespian
'ham?' is the definition.
(ham can mean a bad actor or thespian)
'the spread includes one' is the wordplay.
'spread' becomes 'span' (I've seen this before).
'includes' means one lot of letters goes inside another.
'one' becomes 'I' (Roman numeral).
'span' enclosing 'i' is 'spian'.
'the'+'spian'='THESPIAN'
(Other definitions for thespian that I've seen before include "He paints (anag)" , "Tragic actor" , "Theatrical performer" , "Dramatic performer" , "stage performer" .)