cryptic crossword help

Can anyone help with these:
1. assimilates songbirds when awake (8,2) s?a?????u?
2. deserving of some yarrow or thyme (6) ??r?h?
3. exterior dealership for hummus or taramasalata (3) ?I?
4. helmsman primes gun, I hear (3) ?o?
5. hollows changed heads for tails (7) ?o?l?w?
6. system of taxing? Got a thing about it! (7) ?I?h?r?
7. Eel I say comes from Fens city (3)