For educational purposes, you can see the answers clicking on Reveal or Solution buttons on the side of the puzzle, very easy lesson tool for study/practice.
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Reveal
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Solution
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1 Not manual (9)
6 Not feeling well (3)
7 Music group (4)
8 Straight bar (3)
9 Essential liquid (5)
10 Cutting part of a knife (5)
12 Belonging to (2)
13 Drinks cooler (3)
14 Opposite of stop (2)
17 What's placed in a glove (4)
19 Color of blood (3)
20 Not on an 'in' list (3)
2 To a higher position (2)
3 Engine lubricant (3)
4 __ usual (2)
5 It has a remote connection with TV (7)
6 Original thought (4)
7 In an intermediate position (7)
8 Polish by friction (3)
9 Measure of an object's heaviness (6)
11 Table support (3)
15 Advanced in age (3)
16 Except; nevertheless (3)
18 Get something done (2)