Cryptic crossword No 3,361

Across

1. Look in the catacombs. (4)
2. Little Scots know daughter's not home, on a break (7,4)
3. Female in frozen position (6)
4. Some pens are this amazing! (10)
5. City composer (6)
6. Fancy bell outside furniture shop is appealing (8)
7. Unknown in Northern Ireland, a plant blooms (6)
8. Some gold for god, Norse penman (6)
9. Finally, I use the atlas to find it. (2,4)
10. European hiding in leftover grass - OK! (4)
11. Ill affected with old adage, offered assistance (8)
12. Look back on crumpled foil centre (10)
13. Likely wanting 20D in this state! (2,4)

Down

1. Almost stop grandma having fruit (6)
2. Pretend it's not on, safe from shore (3,3)
3. Bribe defenders to pass to keeper? (8)
4. Sets out purpose before walk (8)
5. Refuse Tuesday bath, capsized to close (6)
6. Husband's on a stretch singing show tune (3,3,5)
7. Actor Bob in part that's wooden? Irony! (2,4)
8. Country almost swelling with song (8)
9. One of couple driving, she makes them take a left with American finalé (6)
10. Old-fashioned fun when Oreo swaps calories for Newton at first (6)
11. We have many thin guests eating whatever (8)
12. Something to miss looking after house (6)
13. Sick being eaten by fish - you jest! (6)