Like the living dead with axes? There's nothing silly about that (10)

'like the living dead' is the definition.
('the living dead' is an oxymoron)

'axes? there's nothing silly about that' is the wordplay.
'axes?' becomes 'xy' (x axis and y axis).
'there's nothing' becomes 'o' (I've seen this in other clues).
'silly' becomes 'moronic'.
'about that' means one lot of letters goes inside another.
'o'+'moronic'='omoronic'
'xy' placed into 'omoronic' is 'OXYMORONIC'.

'with' is the link.