1 I'd be in the sales arena if I didn't have to walk [6]
2 haul it around everything that's fat [6]
3Frank had a meal for a runner [9]
4 the most recent dead holy person [6]
5 what crazy Tom might do in an oil business [7]
6 go back up into the shelter outside Ulan Bator for some food [6]
any help appreciated
5 is WILDCAT (a wildcat mine is a speculative mine).
PS I do this Phoenix crossword regularly and found this one very challenging, did you? (Challenging but v good).