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Plse can anyone help me with these?

17a jerk contracted back muscles for striking effects (6)

E??a??

11a jerry's next to cheat in examinations (6)

??i??s

Wordplay yields an extra letter

Many thanks lisa

17 Eclats (striking effects). I can't remember the extra letter, sorry.
11 Tripos (I think the letter was 'm', from trim=cheat)

Thanks Malone uhave come to the rescue again! :-)

Malone I have nearly all the unclued down entries but can't get the connection! Any clues? :-)

Chambers will help - to be more precise, CHAMBERS will help.