3d. Tradesman needs square root initially (5) t - - - r
8a. Look up, after six, the old instrument. (4) - i - -
20a A green steamship in Arabic translation (8)
- - - s - i - a (I thought this one was 'carbinia' but the letters I have in don't fit.
22a. Tune uprising involving key pack animals (6)
- - - m - s
17d. Feeling left of the ear. (5) a - - - - (Could this be aural, if so why?
All help appreciated.