3d) Repair man makes brother lose out (14)
5d) Choose integrated circuit by sight (5)
9d) End tennis match broken showing loss of enthusiasm (14)
19d) Material that's great, opulent mostly (6)
20d) Wreckage turned up by gentleman on bottom of sea (6)
All help greatly appreciated.
3d.Troubleshooter (anagram of brother lose out)
5d.Opt ic
9d,Disenchantment (anagram of end tennis match)
19d.Fab ric(h)
20d.Debris (Sir + bed reversed)