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17a.2words.8.6.Electric ?????r. Possibly alter circuit. e.g. for this instrument.
15d. 2words.5.4. C???? ?o?e.Become inflamed.seeing two ways to effect dismissal.
19d.7lets.????v?l.Become disentangled from a French party on left.
23a.7lets. T?????d.Burnt a piece of Camembert or Cheddar.

17 guitar (anagram, I think)

19 UN RAVE L
last one TORCHED (hiden)

Thanks Chrise.

15 catch fire