Dm Thursday Please Explain!

[Gavmacp]

One of only a few I got but did not understand was...
1a. Rep-after South America he's back in form (11). Answer salesperson but could not see why.
1d. Bridge chairman is mad with European and Cuban, say(7-8) answer I think is Spanish American but never heard of it.
15a. Mother keeps girl's unexpected bonus (5). M?N?A would appreciate explanation.
20a. Stole vehicle Sinn Fein leaders imported (5). S?A?F
17a. Large hostelry introducing English bed clothes (5). L?N?N I think linen
28a. Train foreign banker to control institute (5,2) B?E?K ?N
22a. Queen perhaps abandons king, a dishonourable man (3). C?D obviously cad but why?
Thank you all in advance your answers are always appreciated!

[AlwaysConfused]

20) scarf

[Mamyalynne]

22

King =Card -minus 'R' For Queen(Regina)=Cad

[sandyRoe]

15 M anna. manna from heaven?
20 s car f
17 linen. L in(e)n
28 break in

[AlwaysConfused]

17) linen
28) break in ?
15) manna - Mother - ma, girl Ann = bonus

[jno]

SA - lesson - with rep (salesperson ie representative) in the middle

[gangesboy]

1d - bridge = span + is + anagram of chairman + E (European)