I can see a word that involves a spasm for 11 across...indeed I suffer from it, but I simply cannot parse it to fit the clue. I have F?B?I?L?T?
Are any of those letters wrong?
I have the answer and can see the porkpie, the runner and the consumed but doesn't the clue suggest that the porkie goes inside the runner, rather than the other way about?
Also, I think I have 14 across - definition one supplying information - but can't see relevance to e = r. I have s_U_A_E_.