Brendan
7a - Mineral of certain type, sort of any iodine (5)
Sorry, I can't parse this too!
34a - Dacosta, say, lacks European skill levels (3)
The escaped letter goes from the clue. What's left is also a name. Check out the list of people with this surname on Wiki — you're looking for a profession rather than a forename. 'European' leads to THREE letter, not one, and 'lacks' is misleading: try looking at is as (result when XXX lacks).
28a - A hint of adult troubles is hairy palms (4)
First letters of 'adult troubles' + 'IS' is the fodder for 'hairy' (anagrind).