Phew - finding it tough this week - especially the top half.
12A My garage is slapdash about Rolls-Royce,being sportive (12,4 words)
s--------r-- (I'm working on it being an anagram of 'mygarageis'+'RR' (Rolls-Royce)
5D Weak e-mail i disregarded picked up in remote be-mail exchange (8,2 words) f----w-- (I'm leaning towards second word being 'away'.