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Can't get 12 down: 'I entered posh clinic playing transistor' (7,4)
Have got T???C?N/???P
Also stuck on 6 down: 'Great competitor leader in regular breaking of records' (9)
Have got A?C??E???L

Silicon chip?

Of course...thanks Bernie. Must have gone wrong with 11 across!

Are you sure of the e? Archival - of records with leader of regular - r gives archrival - great competitor?

Thanks - had put Cresta for 11 across and was so convinced it was right!

What is the clue for 11 across, please? I don't have the crossword.

11a. clue was: stop and take breather after a run
ARREST

Thanks for taking the trouble, Jazzgirl.