Cryptic crossword No 197

Across

1. Revolutionary code discovered in UK and US is a problem for logicians (6)
2. Complaint United Nations risk, following German agreement (8)
3. Small bill team sent back for breakfast item (8)
4. Being of thunderous nature, cross after a bust (6)
5. Running amok, going around disheartened bunch with culturally rich drink (8)
6. Tired, beginning to go blind (6)
7. Accountant from Starbucks, perhaps (4,7)
8. With waves in current, head of zooplankton twice eaten by young fish (6)
9. Reviews generated questions, nonetheless? (8)
10. Support guaranteeing upstanding member, by way of good artist (6)
11. Cold area I fled, shivering, after frost (3,5)
12. Note van carrying a British/European pulse (4,4)
13. Friendly child with parent needing no introduction (6)

Down

1. Speaker's put away, after Macron's first person tours Britain (7)
2. Expert supporting left is easily transferred (8)
3. Housed in Martinique, because French is spoken there (6)
4. If equal's case / We should dismiss / Then add a line / We might find this! (8)
5. Neighbour has a party at home around beginning of July (6)
6. Pinched cars, criminally wonky from time to time (7)
7. Contrast Xi Jinping, ignoring COVID alert, with USA, to opt out (13)
8. Critic's horse perhaps on the radio (8)
9. Honourably discharged Australian natives collecting tax on return (8)
10. Gunners overturned opponent's start (7)
11. Old Egyptian whose leader was silent... (7)
12. ...meandering from Gaza and Giza, going west for the most part (6)
13. Queen's content to leave church, put out (6)