Crossword Genius

Former Labour Minister freed from Civil Service shackles? (4)

Ross

I believe the answer is:

hain

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

'former labour minister freed' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'from civil service shackles?' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
The remaining letters 'ha' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Telegraph.
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