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4d "Engineers joined up, making repeated application" (9)

R?C?Y?I?E the Y may be wrong; I have SKETCHY for 12a "Faint line blocking transmitter" (7)

Any help much appreciated

Recursive?

4d re cursive

12 S L ender - slender

http://www.oxforddictionaries.com/definition/english/recursive

Thanks to all - so presumably that makes 9d "Head in East London kept teacher up" (6) NODDLE ?

Also struggling with 8d "Service wife with yen for a couple of childen" (4)

D?T? Could it be DUTY for service but no idea how the couple of children would fit in ?

Any further help again appreciated

DUTch would be the wife ... lose the ch (children)

Thanks sudokulover, that fits

Noddle is okay and I think the parsing is E. Lon reversed with DD (doctor of divinity - teacher) inside

Thanks chrisg