Quick crossword No 440

Across

1. Mess up all the incompetent French (6)
2. Brewed teas gratify (4)
3. Experienced metalworker short on tungsten (5)
4. Bond I tamper with on reverse? (6,2)
5. Lust, ere I forg'd here a series of deceptions, rekindling the holy union twixt Jamie and Arnold (4,4)
6. Ford in 12d&17d has radiator's original colour roughly stripped away (4)
7. Share devices to succeed (3,2)
8. Heartless teasing makes angry (6)
9. For one, were the voided calculations leading to them being thrown out? (5,8)
10. Backing Burnham manoeuvre's brilliance (4)
11. California leaves member of clergy feeling less love up front for one in next clue? (7,6)
12. Average return to blame (3)
13. Doing as much as (2,2)

Down

1. Man enters post office one time in Costa Rica to work, using keys, impressively? (5,8)
2. Italian ace's game (3)
3. Swears porridge full of junk (5)
4. Don't tell anyone about this, Val - it was your first big job! (3,6)
5. Diversion at exits marks lodge ahead (13)
6. US city "less than clean" (7)
7. Naked, hairy appearance (3)
8. A pen store scribbled invented language (9)
9. Father and I run around to contests in Ford vehicle? (7,5)
10. See 12d