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Lad back at the end of the week in Dr Who (5)

Ross

I believe the answer is:

dalek

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'dr who' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'lad back at the end of the week' is the wordplay.
'back' is a reversal indicator.
'at the end of' indicates one should take the final letters.
The final letters of 'the week' are 'ek'.
'lad' in reverse letter order is 'dal'.
'dal'+'ek'='DALEK'

'in' is the link.

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(Other definitions for dalek that I've seen before include "Croaky-voiced exterminator" , "Dr Who's alien robot" , "Robot with staccato voice" , "Doctor Who adversary" , "Doctor Who monster" .)

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