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I think 6 is…
SONG (lied) with ON (about) in the lead , giving ON SONG (performing well)

Cheers Jono and chrise much appreciated 👍.

17a. Multinational force worried, being put in the middle
INTERPOLATE

(I get the 'interpol' but not the 'ate')

7d. Gratings edges can't be found in this garret
ATTIC

1d. Heart broken by composer with no love for obesity
CORPULENCE

Parses for the above please.

1 D Corpulence, obesity. Core, heart, with Poulenc, composer, without the O, love (no love), inside.
7Maybe Lattice, gratings, without the first and last letters, 'no edges'?

17 A. Ate, worried, is a crossword favourite. The definition is in Chambers, under Eat -'to upset, irritate or worry'.

Thanks Malone...I think you're right about " lattice" for clue 7.

10a. Employee dismissed from engineer's works
OEUVRE

19a. Assailant's terrible rage about key explorer's rejection
AGGRESSOR

9a. Advance on army mostly lacking vigour
RETAINER

Parses for the above please.

Remove Man from Manoeuvre

Anagram of RAGE around G and then ROSS reversed

RE TA INER(T)

10. Man (employee) removed from manOEUVRE (engineer)

Thanks jono and candledave.
Never heard of the explorer Ross, but there you go.