Boy turned up with hot food (4)
I believe the answer is:
nosh
'food' is the definition.
(nosh is a kind of food)
'boy turned up with hot' is the wordplay.
'boy' becomes 'son' (male child).
'turned up' shows that the letters should be reversed in order.
'with' means one lot of letters go next to another.
'hot' becomes 'h' (common abbreviation eg on taps).
'son' written backwards gives 'nos'.
'nos'+'h'='NOSH'
(Other definitions for nosh that I've seen before include "'Food, grub (4)'" , "Eat (sl.)" , "Fare" , "Food - eat greedily" , "(Eat) a snack" .)