Opps! sorry for not giving clues!
Have now understood the answers.
5d Man dropping a full-length steel component.
Mn is the short scientific name for manganese ("a" dropped). Nice clue.
22d Partition in stable that may be jumped.
Yes, a "bail" is a partition between stalls in a stable or barn. Unfortunately "rail" would also be a perfectly good answer, but perhaps too simple for a cryptic crossword.