No problem at all! Definition = “This can keep track of current”; time=T, base=E (e is the base of the natural logarithm — this is a standard crossword abbreviation, although probably obscure to someone who hasn’t seen it before), those both go inside (“wearing”) “nail in” = HAMMER, which might become ‘AMMER when pronounced by a cockney.
Hope that’s clear, it’s a little clumsy as clues go — it’s a nerfed version of a previous iteration with a cleaner surface but a more difficult construction. Maybe I’ll edit it again.