Crossword Genius

Criminal let in here to steal order from political official (5-4,4)

Ross

I believe the answer is:

three-line whip

I'm a little stuck... Click here to teach me more about this clue!

'order from political official' is the definition.
'three-line whip' can be an answer for 'order' (order to UK MPs to vote). I am not certain of the 'from political official' bit.

'criminal let in here to steal' is the wordplay.
'criminal' is an anagram indicator.
'to steal' becomes 'whip' (I've seen this before).
'let'+'in'+'here'='letinhere'
'letinhere' is an anagram of 'threeline'.
'threeline'+'whip'='THREE-LINE WHIP'

Can you help me to learn more?

(Other definitions for three-line whip that I've seen before include "Urgent call to vote" , "Parliamentary voting instruction" , "Firm instruction to voting MPs" , "Important instruction to MPs" , "Demand for MP's vote" .)

I've seen this clue in The Times.
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