Cryptic crossword No 4,058

Across

1. Slippery customer involved in fake election (3)
2. Chaps get older, and rise shakily, creating muddles (10)
3. Principle and others receiving greeting (5)
4. Comatose, therefore cure doubtful, try elsewhere (9)
5. Current fallout was hastily contained (7)
6. Pass tips of comb over locks (3)
7. I favoured grant being returned (5)
8. Show medic, pocketing spectacles, way to eliminate bugs (6,4)
9. Harry was bound to be entertaining (7)
10. Perplexed when BBC media outsold alternative (15)
11. "Yesterday", for Nancy covering song, was more problematic (7)
12. Enormous - I can't move round it! (7)
13. Reason to limit drink? (9)

Down

1. Enthusiastic about pub's profits too (4,3,7)
2. Room after refurbishment with blue stripped, revealing gold decor (6)
3. Jewish scholar has tribe confused (8)
4. Construction set has hub attached to nuts overtightened initially (7)
5. Steal a march, and understand article by speculator frequently lacking time (3,3,6,2)
6. Arrangement of elements of occasional furniture? (8,5)
7. Spies infiltrating act is chaotic, causing nerve trouble (8)
8. Worker on the fiddle? (7)
9. Pressed on during dire mix-up (6)
10. Definitely not a reason to stop playing backgammon (2,4)
11. Steer, say, straying heifers or herd (13)
12. Panama, perhaps, behind the times (3,3)