Boils spuds or pasta for relative to tuck into (10)

'boils' is the definition.
(both can mean lumps on the body)

'spuds or pasta for relative to tuck into' is the wordplay.
I cannot really understand how this works, but
'relative' could be 'uncle' (uncle is a kind of relative) and 'uncle' is located in the answer.
'spuds or pasta' could be 'carbs' (carbohydrates) and 'carbs' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...