TV programme's preview including question mark (10)

I believe the answer is:

taskmaster

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'tv programme's preview including question mark' is the definition.
I can't tell whether this defines the answer.

'preview including question mark' is the wordplay.
'preview' becomes 'taster' (a taster is a preview or sneak peek).
'including' is an insertion indicator.
'question' becomes 'ask' (asking a question).
'mark' becomes 'm'.
'ask'+'m'='askm'
'taster' going around 'askm' is 'TASKMASTER'.

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(Other definitions for taskmaster that I've seen before include "slave-driver" , "Disciplinarian" , "One imposing heavy workload" , "One supervising" , "One in charge of jobs (usually hard)" .)

I've seen this clue in The Independent.

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