Some strange ones today. Hopefully not so strange in a few minutes...
Self-referential hint = clue.
Pump air into salt = carbonate.
Project 'Old Invader' cut short = jut. (I know that project=jut.)
And here are two consecutive clues. The answer to 17 is 'tank':
1. 2 typically has no memory of fight...
2. ...it's over German 17.
Answers are combat and tiger respectively. (Tiger was a German tank.)
Many thanks.